Celestron PowerSeeker 127EQ Renovation
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
The two parts of the cell were sanded, masked-off, and matte-blackened where necessary...
That looks like a birthday-cake, on Vulcan.
The other half; the other was also primed before blackening...
The two parts completed, to a point. Gone is that glossy, reflective, hammered-black finish...
Hmm, I didn't paint right below the clips' posts...
Something special must be going there.
My late father dabbled in wood-working, and as I do as well. He left me this nice piece of English walnut...
That's actually a scrap from a larger board that I've already used, but all I needed was the tip...
I made the new supports for the primary-mirror slightly smaller than the rubber ones.
They were shellacked...
...then epoxied into place...
That looks like a birthday-cake, on Vulcan.
The other half; the other was also primed before blackening...
The two parts completed, to a point. Gone is that glossy, reflective, hammered-black finish...
Hmm, I didn't paint right below the clips' posts...
Something special must be going there.
My late father dabbled in wood-working, and as I do as well. He left me this nice piece of English walnut...
That's actually a scrap from a larger board that I've already used, but all I needed was the tip...
I made the new supports for the primary-mirror slightly smaller than the rubber ones.
They were shellacked...
...then epoxied into place...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
I touched up the matte-black round and about the blocks...
...and topped them with matte-black art-paper, using wood-glue...
A few years ago, I ordered a square of leather, and for a mat for my Czech turntable...
Analogue is still big over there, and seems to be experiencing a renaissance over here as well.
I don't throw anything away...
Voilà...
...and topped them with matte-black art-paper, using wood-glue...
A few years ago, I ordered a square of leather, and for a mat for my Czech turntable...
Analogue is still big over there, and seems to be experiencing a renaissance over here as well.
I don't throw anything away...
Voilà...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
The primary-mirror resting upon its new digs...
...and the backside of same. That's certainly a clean and clear blank of soda-lime plate. Hmm, let's see if we can get this right...
Nope.
Not a chance.
Bingo!
I have read elsewhere that it's not necessary to center-spot a spherical primary-mirror. If it's a bit off-center, no problem, for it's a sphere. I understand that, but that should not be known to most, particularly those new and even intermediate to the pastime, as that can result in a parabola not being center-spotted. As I see it, the mirror is round, it has a center, and therefore it's going to have a center-spot.
...and the backside of same. That's certainly a clean and clear blank of soda-lime plate. Hmm, let's see if we can get this right...
Nope.
Not a chance.
Bingo!
I have read elsewhere that it's not necessary to center-spot a spherical primary-mirror. If it's a bit off-center, no problem, for it's a sphere. I understand that, but that should not be known to most, particularly those new and even intermediate to the pastime, as that can result in a parabola not being center-spotted. As I see it, the mirror is round, it has a center, and therefore it's going to have a center-spot.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
The primary-mirror also has a stoned edge, just a sliver, but an edge to be blackened nonetheless...
Oh dear, I seem to have blackened it too much.
Oh, that was just the reflection off of my monitor.
Glamour shot...
See that little dot jutting into the reflective surface along the rim? That's where the edge was ever so slightly chipped somehow, and at the factory of course.
The mirror was then set aside...
Oh dear, I seem to have blackened it too much.
Oh, that was just the reflection off of my monitor.
Glamour shot...
See that little dot jutting into the reflective surface along the rim? That's where the edge was ever so slightly chipped somehow, and at the factory of course.
The mirror was then set aside...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
With the new blocks for the primary-mirror, particularly with the addition of the leather-pads, I had to make spacers for the retaining-clips, to raise them a bit higher...
The clips' hardware was sanded and matte-blackened...
After trial-and-error, I finally arrived at this clearance for all three clips round the mirror...
The primary-cell completed...
I will need to blacken the tips of the adjustment-screws in future...
I thought this interesting, and when the mirror was sitting in front of the monitor...
They appear as Ronchi patterns.
The primary-cell took only two layers of aluminum-foil tape, and for a snug fit onto the optical-tube.
The clips' hardware was sanded and matte-blackened...
After trial-and-error, I finally arrived at this clearance for all three clips round the mirror...
The primary-cell completed...
I will need to blacken the tips of the adjustment-screws in future...
I thought this interesting, and when the mirror was sitting in front of the monitor...
They appear as Ronchi patterns.
The primary-cell took only two layers of aluminum-foil tape, and for a snug fit onto the optical-tube.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
The dust-cap, and quite substantial for any telescope, at any price...
Upon taking it into hand, I snapped off every last clip, and in less than a minute...
I can't have those clips scratching up the matte-black finish of the inner rim of the cowling when the cap is inserted.
The wide tabs had their corners rounded and the tabs bevelled, then the inner side of the cap was sanded, including theaperture stop...
The inner side and theaperture -stop's wall and forward-facing rim were matte-blackened. Also, the gap between two of the tabs was widened, and to easily accommodate the now-thicker, single stalk of the cowling...
Self-adhesive, hard, red-felt strips were attached to the tabs...
The cap fits perfectly; not too tight, nor too loose...
For an improved seal, I applied a narrow strip of flocking all round the outer perimeter of the cap...
This is what I call the cap-keeper...
...and a rather poor one as it arrived, as the cap falls right off. So, I applied a strip of flocking halfway round the side; done.
The diameter of theaperture -stop is a "generous" 40mm, and if that wasn't bad enough, it's obstructed off to one side by the secondary-hub...
The designer didn't have to make the hub over-sized, but it is what it is. In any event, that would be the near-equivalent to a 40mmf/ 25 achromat; joy joy.
Incidentally, you can see the head of one of the three secondary-hub's set-screws there. I had to abandon the socket-caps illustrated earlier, as they weren't threaded along their entire length, so I settled upon the button-socket type that were fully threaded. I can still adjust them with just my fingers, albeit with a bit more difficulty. In any event, I can replace them at any time.
Upon taking it into hand, I snapped off every last clip, and in less than a minute...
I can't have those clips scratching up the matte-black finish of the inner rim of the cowling when the cap is inserted.
The wide tabs had their corners rounded and the tabs bevelled, then the inner side of the cap was sanded, including the
The inner side and the
Self-adhesive, hard, red-felt strips were attached to the tabs...
The cap fits perfectly; not too tight, nor too loose...
For an improved seal, I applied a narrow strip of flocking all round the outer perimeter of the cap...
This is what I call the cap-keeper...
...and a rather poor one as it arrived, as the cap falls right off. So, I applied a strip of flocking halfway round the side; done.
The diameter of the
The designer didn't have to make the hub over-sized, but it is what it is. In any event, that would be the near-equivalent to a 40mm
Incidentally, you can see the head of one of the three secondary-hub's set-screws there. I had to abandon the socket-caps illustrated earlier, as they weren't threaded along their entire length, so I settled upon the button-socket type that were fully threaded. I can still adjust them with just my fingers, albeit with a bit more difficulty. In any event, I can replace them at any time.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
Regrettably, I never took a photo of the kit upon arrival, but only after I had renovated both the OTA and the CG -2(EQ -1) mount...
That's only a prop-shot, as the two will never "dance" together 'neath the celestial void. I can just hear the mount cracking asunder.
I might shave by using the back of the mirror here...
With the "naugahyde" plate removed, a rather large gap was left between the back of the mirror and the frame's opening. All manner and sorts of things could crawl or fly up into the tube.
The solution to that begins with this square of 100-mesh screen...
Also, that way I won't have to attach a shower-cap over the back when storing.
That's only a prop-shot, as the two will never "dance" together 'neath the celestial void. I can just hear the mount cracking asunder.
I might shave by using the back of the mirror here...
With the "naugahyde" plate removed, a rather large gap was left between the back of the mirror and the frame's opening. All manner and sorts of things could crawl or fly up into the tube.
The solution to that begins with this square of 100-mesh screen...
Also, that way I won't have to attach a shower-cap over the back when storing.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
Three thin discs were made from a short stainless-steel, yet ferrous, rule, and epoxied to the frame...
In hindsight, I would have rather drilled holes into the frame and installed thick, steel plugs. I can do that in future, still.
Locally, all I can find are small neodymium magnets, but online I found larger and thicker ones...
The screen's frame was made from aluminum-sheet and thin plywood...
The larger magnets were epoxied into the plywood portion...
Both components were painted, or dyed, or primed, where necessary...
In hindsight, I would have rather drilled holes into the frame and installed thick, steel plugs. I can do that in future, still.
Locally, all I can find are small neodymium magnets, but online I found larger and thicker ones...
The screen's frame was made from aluminum-sheet and thin plywood...
The larger magnets were epoxied into the plywood portion...
Both components were painted, or dyed, or primed, where necessary...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
I used 5-minute epoxy, so I had to work fast...
That, my great-grandmother's seven-pounder, made in Sheffield, England long ago; and underneath that, an old copy of Patrick Moore's "Amateur Astronomy", and to ensure the "feng shui" of the operation. At one point, I lifted the aforementioned off and inspected...
Looks good to me, then the book and iron had gone back onto it.
I finally got all the slivers of screen cut back to the outer edge of the frame...ouch. The screen was masked off, the black-dyed side of the plywood was clear-coated, and then the frame mounted onto a stand of my own creation...
The edge of the frame all round was sealed with a mixture of J-B Weld and sawdust, for a textured appearance, and in keeping with the final finish. Also, the last of those painful slivers of screen were entombed...
The final finish? What else but that ubiquitous hammered-black, and for mail-boxes...
The frame grabs onto the cell quite well. You can move and swing the telescope all round and it will not pop off. It's even self-centering to a degree. But if you bump it with the hand or an object, off it flies onto the floor or the ground.
With that, in so far as the physical aspects, the telescope was completed.
That, my great-grandmother's seven-pounder, made in Sheffield, England long ago; and underneath that, an old copy of Patrick Moore's "Amateur Astronomy", and to ensure the "feng shui" of the operation. At one point, I lifted the aforementioned off and inspected...
Looks good to me, then the book and iron had gone back onto it.
I finally got all the slivers of screen cut back to the outer edge of the frame...ouch. The screen was masked off, the black-dyed side of the plywood was clear-coated, and then the frame mounted onto a stand of my own creation...
The edge of the frame all round was sealed with a mixture of J-B Weld and sawdust, for a textured appearance, and in keeping with the final finish. Also, the last of those painful slivers of screen were entombed...
The final finish? What else but that ubiquitous hammered-black, and for mail-boxes...
The frame grabs onto the cell quite well. You can move and swing the telescope all round and it will not pop off. It's even self-centering to a degree. But if you bump it with the hand or an object, off it flies onto the floor or the ground.
With that, in so far as the physical aspects, the telescope was completed.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
To ensure success in collimating the telescope, and to where you will enjoy sharp, pleasing images at the higher and highest powers of which the telescope's aperture is capable, albeit partly to what the atmosphere will allow during a given observation, the following is strongly suggested...
1. Renovate the focusser to where the draw-tube racks in and out, true and square within its housing, and with no binding nor slop whatsoever. This applies to all telescopes actually, and regardless of design. You also have the option of cleaning the factory-grease from the rack and pinion, and replacing that with Super Lube, a high-quality, PTFE-based grease, to be applied sparingly.
2. Collimating the telescope, and the retention of same, is made that much easier if the rubber-grommets of the primary-cell are replaced with metal-springs.
Both aspects have been described and illustrated within this thread.
I have a laser-collimator. It's an inexpensive unit, although it did come with a triplet-lens for the laser, and for a sharper, tighter spot. My own arrived requiring collimation, as most do. I collimated it, and with a jig of my own design...
However...
I suppose they're fine for larger, longer Newtonians and Newtonian-Dobsons, and otherwise as acat -toy, but definitely not for these smaller reflectors.
I prefer old-school, passive tools, like this Tectron sight-tube, with cross-hairs...
The modern incarnation combines a Cheshire with a sight-tube/cross-hairs; for example...
That type is readily available, and recommended.
I also use a collimation-cap, as a "second opinion". The cap also allows you watch whilst you batten down the adjustment-screws of either the secondary or primary mirrors, and to keep the alignment of either intact whilst so doing...
That one came with my Orion "StarBlast 6"; a 6"f/ 5 Newtonian-Dobson, and a one-arm bandit. A collimation-cap can be purchased from Agena Astro of California, or First Light Optics in the UK, presently; or one can be made from the focusser's dust-cap...
You simply drill a 2mm hole, with a 2mm drill-bit, as precisely in the center of the cap as possible, then line the underside with a circle of aluminum-foil, the dull or reflective side, take your pick. Try both.
1. Renovate the focusser to where the draw-tube racks in and out, true and square within its housing, and with no binding nor slop whatsoever. This applies to all telescopes actually, and regardless of design. You also have the option of cleaning the factory-grease from the rack and pinion, and replacing that with Super Lube, a high-quality, PTFE-based grease, to be applied sparingly.
2. Collimating the telescope, and the retention of same, is made that much easier if the rubber-grommets of the primary-cell are replaced with metal-springs.
Both aspects have been described and illustrated within this thread.
I have a laser-collimator. It's an inexpensive unit, although it did come with a triplet-lens for the laser, and for a sharper, tighter spot. My own arrived requiring collimation, as most do. I collimated it, and with a jig of my own design...
However...
I suppose they're fine for larger, longer Newtonians and Newtonian-Dobsons, and otherwise as a
I prefer old-school, passive tools, like this Tectron sight-tube, with cross-hairs...
The modern incarnation combines a Cheshire with a sight-tube/cross-hairs; for example...
That type is readily available, and recommended.
I also use a collimation-cap, as a "second opinion". The cap also allows you watch whilst you batten down the adjustment-screws of either the secondary or primary mirrors, and to keep the alignment of either intact whilst so doing...
That one came with my Orion "StarBlast 6"; a 6"
You simply drill a 2mm hole, with a 2mm drill-bit, as precisely in the center of the cap as possible, then line the underside with a circle of aluminum-foil, the dull or reflective side, take your pick. Try both.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
It's time to collimate the "Bird"...
The corrective, barlowing doublet-lens and its cell MUST be removed from the draw-tube in order to collimate this telescope. Again...
...then reinstall the draw-tube.
I cover the top of a small table-lamp, with gift-tissue in this instance, and secured with a rubber-band. I then place the lamp in front of the tube, and to illuminate the collimation-scenes...
With the sight-tube inserted, the secondary-mirror must be centered directly under the focusser, and appear as a perfect circle...
Note: It helps to insert a piece of paper in between the two mirrors when aligning the secondary-mirror, to keep one from "seeing" the other. That is described here, and on the second page...
http://www.schlatter.org/Dad/Astronomy/collimate.htm
Other collimation-tutorials online may also be consulted.
Adjusting the secondary-mirror is accomplished with the four screws of the secondary-hub...
The larger center-screw is spring-loaded, and moves the secondary-mirror back and forth along the axis, or length, of the telescope's optical tube. You want to move the mirror directly under the focusser with the center-screw. The mirror also rotates on the center-screw. The three smaller screws round the perimeter of the hub adjust the tilt of the mirror. The secondary-mirror can be rotated and tilted in every conceivable direction and position, but it must come to rest in only one position, with its center aligned with the center of the draw-tube of the focusser, and the centers of the secondary and primary mirrors; all together, in unison, and in a L-shaped path...
The corrective, barlowing doublet-lens and its cell MUST be removed from the draw-tube in order to collimate this telescope. Again...
...then reinstall the draw-tube.
I cover the top of a small table-lamp, with gift-tissue in this instance, and secured with a rubber-band. I then place the lamp in front of the tube, and to illuminate the collimation-scenes...
With the sight-tube inserted, the secondary-mirror must be centered directly under the focusser, and appear as a perfect circle...
Note: It helps to insert a piece of paper in between the two mirrors when aligning the secondary-mirror, to keep one from "seeing" the other. That is described here, and on the second page...
http://www.schlatter.org/Dad/Astronomy/collimate.htm
Other collimation-tutorials online may also be consulted.
Adjusting the secondary-mirror is accomplished with the four screws of the secondary-hub...
The larger center-screw is spring-loaded, and moves the secondary-mirror back and forth along the axis, or length, of the telescope's optical tube. You want to move the mirror directly under the focusser with the center-screw. The mirror also rotates on the center-screw. The three smaller screws round the perimeter of the hub adjust the tilt of the mirror. The secondary-mirror can be rotated and tilted in every conceivable direction and position, but it must come to rest in only one position, with its center aligned with the center of the draw-tube of the focusser, and the centers of the secondary and primary mirrors; all together, in unison, and in a L-shaped path...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
After the alignment of the secondary-mirror is completed, I then remove the paper separating the two mirrors, and begin tilting the primary-mirror towards the secondary. The sight-tube, or modern Cheshire with cross-hairs, is left inserted.
Back and forth between the mirrors I go, carefully and slowly adjusting the secondary, then the primary, then the secondary, then the primary, and until I see this...
When you see the cross-hairs of the sight-tube lined up with the mirror-image of the cross-hairs(both in red), along with the center-spot of the primary-mirror(outlined in blue), you're golden...
Note, there in the center, how the lighter circle(outlined in yellow) is not centered within the secondary-shadow(outlined in green). That is normal for a short, fast reflector, and at a nativef/ 4(yet an effective f/ 8 with the doublet-lens in place). That is known as the secondary-offsetting, and it occurs automatically during a normal collimation procedure. There's nothing for the user to do to accomplish the off-setting.
I then insert a collimation-cap to verify...
...right on the money.
After collimating, return the doublet-lens and cell to the end of the draw-tube. To keep the collimation intact, and to keep from having to remove the doublet-lens frequently, be certain to tighten all of the adjustment-screws for both the secondary and primary mirrors, and whilst keeping the collimation intact. Whilst tightening the screws, observe the scene with the collimation-cap to make certain that nothing shifts out of alignment...
...and you're done.
Back and forth between the mirrors I go, carefully and slowly adjusting the secondary, then the primary, then the secondary, then the primary, and until I see this...
When you see the cross-hairs of the sight-tube lined up with the mirror-image of the cross-hairs(both in red), along with the center-spot of the primary-mirror(outlined in blue), you're golden...
Note, there in the center, how the lighter circle(outlined in yellow) is not centered within the secondary-shadow(outlined in green). That is normal for a short, fast reflector, and at a native
I then insert a collimation-cap to verify...
...right on the money.
After collimating, return the doublet-lens and cell to the end of the draw-tube. To keep the collimation intact, and to keep from having to remove the doublet-lens frequently, be certain to tighten all of the adjustment-screws for both the secondary and primary mirrors, and whilst keeping the collimation intact. Whilst tightening the screws, observe the scene with the collimation-cap to make certain that nothing shifts out of alignment...
...and you're done.
Last edited by Sky Tinker on Wed Jan 01, 2020 6:06 am, edited 1 time in total.
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- notFritzArgelander
- In Memory
- Articles: 0
- Posts: 14925
- Joined: Fri May 10, 2019 4:13 pm
- 4
- Location: Idaho US
- Status:
Offline
-
TSS Awards Badges
Re: Celestron PowerSeeker 127EQ Renovation
You're right to disbelieve that! It's only "not a problem" with perfect collimation. I like center spots.Sky Tinker wrote: ↑Mon Dec 30, 2019 7:30 am I have read elsewhere that it's not necessary to center-spot a spherical primary-mirror. If it's a bit off-center, no problem, for it's a sphere. I understand that, but that should not be known to most, particularly those new and even intermediate to the pastime, as that can result in a parabola not being center-spotted. As I see it, the mirror is round, it has a center, and therefore it's going to have a center-spot.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
Sky Tinker wrote: ↑Wed Jan 01, 2020 4:37 am ...with its center aligned with the center of the draw-tube of the focusser, and the centers of the secondary and primary mirrors...
Correction: ...with its center aligned with the center of the draw-tube of the focusser and the center of the primary mirror...
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- notFritzArgelander
- In Memory
- Articles: 0
- Posts: 14925
- Joined: Fri May 10, 2019 4:13 pm
- 4
- Location: Idaho US
- Status:
Offline
-
TSS Awards Badges
Re: Celestron PowerSeeker 127EQ Renovation
Truly an epic makeover!
Your photos tell me that my recollection (posted earlier this week) that the "corrector" isn't a proper Jones-Bird optic but rather Barlow lens pressed into service was correct. The difference in thickness of the lenses in the doublet gives it away.
See the single doublet (3) in the figure under the heading "Conventional Barlow lens"
https://www.telescope-optics.net/miscel ... optics.htm
A double doublet is shown in the figure at the left with a single doublet to the right.
A true Jones-Bird has a doublet that is more equal. See figure 154.
https://www.telescope-optics.net/sub_ap ... htm#bottom
Your photos tell me that my recollection (posted earlier this week) that the "corrector" isn't a proper Jones-Bird optic but rather Barlow lens pressed into service was correct. The difference in thickness of the lenses in the doublet gives it away.
See the single doublet (3) in the figure under the heading "Conventional Barlow lens"
https://www.telescope-optics.net/miscel ... optics.htm
A double doublet is shown in the figure at the left with a single doublet to the right.
A true Jones-Bird has a doublet that is more equal. See figure 154.
https://www.telescope-optics.net/sub_ap ... htm#bottom
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
I can't be certain if the doublet-lens does or does not correct for spherical-aberration until I observe and test further. The images I've seen after collimating have been great; other than comatic views at the lower powers, and in that it's behaving as annotFritzArgelander wrote: ↑Wed Jan 01, 2020 6:17 am Truly an epic makeover!
Your photos tell me that my recollection (posted earlier this week) that the "corrector" isn't a proper Jones-Bird optic but rather Barlow lens pressed into service was correct. The difference in thickness of the lenses in the doublet gives it away.
See the single doublet (3) in the figure under the heading "Conventional Barlow lens"
https://www.telescope-optics.net/miscel ... optics.htm
A double doublet is shown in the figure at the left with a single doublet to the right.
A true Jones-Bird has a doublet that is more equal. See figure 154.
https://www.telescope-optics.net/sub_ap ... htm#bottom
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
- notFritzArgelander
- In Memory
- Articles: 0
- Posts: 14925
- Joined: Fri May 10, 2019 4:13 pm
- 4
- Location: Idaho US
- Status:
Offline
-
TSS Awards Badges
Re: Celestron PowerSeeker 127EQ Renovation
That would be one explanation. :shrug: I just don't know about that.Sky Tinker wrote: ↑Wed Jan 01, 2020 7:59 amI can't be certain if the doublet-lens does or does not correct for spherical-aberration until I observe and test further. The images I've seen after collimating have been great; other than comatic views at the lower powers, and in that it's behaving as annotFritzArgelander wrote: ↑Wed Jan 01, 2020 6:17 am Truly an epic makeover!
Your photos tell me that my recollection (posted earlier this week) that the "corrector" isn't a proper Jones-Bird optic but rather Barlow lens pressed into service was correct. The difference in thickness of the lenses in the doublet gives it away.
See the single doublet (3) in the figure under the heading "Conventional Barlow lens"
https://www.telescope-optics.net/miscel ... optics.htm
A double doublet is shown in the figure at the left with a single doublet to the right.
A true Jones-Bird has a doublet that is more equal. See figure 154.
https://www.telescope-optics.net/sub_ap ... htm#bottomf/ 4 Newtonian should. Do you think it's possible that someone at the factory was having a good day and decided to go ahead and parabolise my mirror? Definitely stranger things have happened. Perhaps Synta is now parabolising all of them.
To evaluate expected
I would not rule out that you, yes YOU, did an outstanding job of rebuilding and permitted the optics to perform well.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
- Lady Fraktor
- Infinity and Beyond Ambassador
- Articles: 0
- Posts: 10018
- Joined: Mon Apr 29, 2019 9:14 pm
- 5
- Location: Slovakia
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
I would have to agree with nFA on that point, taking the time to correct the issues will make more of a difference than anything else.
Gabrielle
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
- Michael131313
- Orion Spur Ambassador
- Articles: 0
- Posts: 969
- Joined: Sun May 12, 2019 5:39 pm
- 4
- Location: San Jose del Valle , Nayarit, Mexico
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
Thanks very much for your thread. Fantastic job. I learned a lot.
ES AR 102 102mm, f/6.5, ES 254mm f/5 DOB, Obie 10x50, GSO SV 30mm, ES 68° 20mm, ES 82° 14mm, 11mm, 8.8 mm, 6.8mm, 4.7mm. Twilight 1 mount.
- Sky Tinker
- Jupiter Ambassador
- Articles: 0
- Posts: 239
- Joined: Sat Jul 27, 2019 4:16 am
- 4
- Location: Mid-South, U.S.
- Status:
Offline
Re: Celestron PowerSeeker 127EQ Renovation
The one aspect that makes this type of telescope so attractive to those first starting out is, above all else, the low price. The short tube, and perhaps the larger aperture at that price-point, are also attractants. For some, it is all that they can afford, hence my interest in helping to make the ownership less of a burden and regret; to get it out under the sky, instead of using it as a decoration for the living-room. It does appear rather snazzy for the latter, but I digress.
For others, they do not wish to place a lot of money into a first telescope, for they're not certain if it will retain their interest. They, too, may benefit from a bit of guidance.
Decent and even very good performance may be had with these only if they're collimated well, that's all. Some kits do arrive well-collimated, as some reviewers attest. Consequently, they love the telescope. Some love it, others hate it, and it all boils down to the degree of collimation upon arrival. You have two strikes against that however: the plasticky, wonky focusser, and the rubber-grommets of the primary-cell. Then there's a third even: also having to remove the doublet-lens to collimate the telescope properly; no ifs, ands, or buts.
"That's too much work! Why bother with it at all???"
Three strikes, and it's out, for many.
For the experienced, however, the kit makes for an absolutely rewarding and wonderful puttering and tinkering about. But I wasn't about to transform this sow's ear into a silk purse(as it is now in fact) without sharing my experience, and in explaining how to simply make it worth the while, albeit if acquired by accident. That's why I purchased it in the first place, to help others; but no, not to promote it...
For the brave and inquisitive, do not consider the kit for the mount. Do not consider the mount at all, unless you have smaller telescopes, like a 90mm Maksutov, or an 80mmf/ 5 achromat...
...although smaller counterweights will be required.
No, get it only for theOTA itself, and have at it.
For others, they do not wish to place a lot of money into a first telescope, for they're not certain if it will retain their interest. They, too, may benefit from a bit of guidance.
Decent and even very good performance may be had with these only if they're collimated well, that's all. Some kits do arrive well-collimated, as some reviewers attest. Consequently, they love the telescope. Some love it, others hate it, and it all boils down to the degree of collimation upon arrival. You have two strikes against that however: the plasticky, wonky focusser, and the rubber-grommets of the primary-cell. Then there's a third even: also having to remove the doublet-lens to collimate the telescope properly; no ifs, ands, or buts.
"That's too much work! Why bother with it at all???"
Three strikes, and it's out, for many.
For the experienced, however, the kit makes for an absolutely rewarding and wonderful puttering and tinkering about. But I wasn't about to transform this sow's ear into a silk purse(as it is now in fact) without sharing my experience, and in explaining how to simply make it worth the while, albeit if acquired by accident. That's why I purchased it in the first place, to help others; but no, not to promote it...
For the brave and inquisitive, do not consider the kit for the mount. Do not consider the mount at all, unless you have smaller telescopes, like a 90mm Maksutov, or an 80mm
...although smaller counterweights will be required.
No, get it only for the
"Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy! Andromeda! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
"Desserts tend to corrupt, and absolutely delicious desserts corrupt absolutely." - Chef Acton
Alan
Apochromat: Takahashi FS-102 4" f/8 - Achromats: Meade S102 102mm f/5.9, Antares 805 80mm f/6(flocked & blackened), Meade "Polaris" 70mm f/12.9, Sears(Towa) #4-6340 50mm f/12(flocked & blackened) - Newtonians: Orion 6" f/5(flocked & blackened) - Catadioptrics: Explore Scientific 127mm f/15 Maksutov-Cassegrain, Celestron "PowerSeeker" 127mm f/8 "Bird Jones" reflector(modified, flocked, blackened, and collimated!) - Mounts: Meade LX70(EQ-5), Astro-Tech Voyager I alt-azimuth
Create an account or sign in to join the discussion
You need to be a member in order to post a reply
Create an account
Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute