Yes. The only thing that I think is missing is a 5mm exit pupil 20 mmturboscrew wrote: ↑Thu Jul 22, 2021 3:25 pm Does this look like a good plan?Code: Select all
focal length magnification exit pupil 26 46 6.50 15 80 3.75 12 100 3.00 8 150 2.00 6 200 1.50 5 240 1.25 4 300 1.00
New higher power eyepiece for my scope. Suggestions?
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Re: New higher power eyepiece for my scope. Suggestions?
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Re: New higher power eyepiece for my scope. Suggestions?
Code: Select all
focal length magnification exit pupil
26 46 6.50
20 60 5.00
15 80 3.75
12 100 3.00
8 150 2.00
6 200 1.50
5 240 1.25
4 300 1.00
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
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Re: New higher power eyepiece for my scope. Suggestions?
Yes, I’d be happy with that. BTW the largish nebulosity that the 20mm would serve well is in Orion during your prime dark time. I like catching the Horsehead and find that picking it up is easiest at anyturboscrew wrote: ↑Thu Jul 22, 2021 3:36 pm So, like this?
Code: Select all
focal length magnification exit pupil 26 46 6.50 20 60 5.00 15 80 3.75 12 100 3.00 8 150 2.00 6 200 1.50 5 240 1.25 4 300 1.00
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Re: New higher power eyepiece for my scope. Suggestions?
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Re: New higher power eyepiece for my scope. Suggestions?
I didn't find the data.
Without
OH, and "The Explore Scientific
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
I don't suffer from insanity. I'm enjoying every minute of it.
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Re: New higher power eyepiece for my scope. Suggestions?
You must get the TS Optics UWA 82 degree eyepieces.
You get the big field but these are better on the planets than the Televue Delites. The only things better are the Takahashi TOE's 52 degree for the planets. There are similar ones but they are not nitrogen charged and are a little less good.
Triple lensed fracs are so yummy when looking at planets.
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Re: New higher power eyepiece for my scope. Suggestions?
That means the 15mm and 12mm are essentially duplicates.
And you certainly don't need a 20mm for in between the 26mm and 15mm.
A constant magnification change could be: 24mm, 12mm, 8mm, 6mm, 4.8-5mm, 4mm.
26mm is close enough. I don't think you need the 15mm, though having an "extra" eyepiece is OK.
Currently using a 12.5" dob and a 4" apo refractor
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Re: New higher power eyepiece for my scope. Suggestions?
That is silly. Mileages vary.
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Re: New higher power eyepiece for my scope. Suggestions?
Yeah, I just don't buy constant magnification change as a good guiding principle. Apart from a 5mm exit pupil being essential for some objects really old folks find that 6mm exit pupil might be a goodDon Pensack wrote: ↑Thu Jul 22, 2021 6:43 pm To be honest, it's hard to see a difference in magnification <30x between eyepieces.
That means the 15mm and 12mm are essentially duplicates.
And you certainly don't need a 20mm for in between the 26mm and 15mm.
A constant magnification change could be: 24mm, 12mm, 8mm, 6mm, 4.8-5mm, 4mm.
26mm is close enough. I don't think you need the 15mm, though having an "extra" eyepiece is OK.
I still find exit pupil increments at the long end and focal length increments shorter than 2mm exit pupil to be a better principle for optimizing by object and sky conditions both. Constant magnification increments might make an adequate minimalist set but it won't optimize performance. YMMV.
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Re: New higher power eyepiece for my scope. Suggestions?
Looks reasonable. There is a bit of redundancy, but since your 6mm and 15mm are minimal glass 50 deg EPs having 12mm and 5mm wide field long eye relief EPs would still be useful. Alternatively, you may decide to split the difference between 15mm and 6mm and get just oneturboscrew wrote: ↑Thu Jul 22, 2021 3:36 pm So, like this?
Code: Select all
focal length magnification exit pupil 26 46 6.50 20 60 5.00 15 80 3.75 12 100 3.00 8 150 2.00 6 200 1.50 5 240 1.25 4 300 1.00
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: New higher power eyepiece for my scope. Suggestions?
I thought it was a friendly poke, no?
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: New higher power eyepiece for my scope. Suggestions?
Hopefully so. I may be running a sense of humor deficit today having had a bad night of insomnia without compensating fun. Maybe I'll take a nap.
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Re: New higher power eyepiece for my scope. Suggestions?
Going by exit pupil seems to work consistently for me, no matter what scope I am using, so I am going by exit pupil now and just adding one or two EPs in between if need arises.notFritzArgelander wrote: ↑Thu Jul 22, 2021 7:28 pmYeah, I just don't buy constant magnification change as a good guiding principle. Apart from a 5mm exit pupil being essential for some objects really old folks find that 6mm exit pupil might be a goodDon Pensack wrote: ↑Thu Jul 22, 2021 6:43 pm To be honest, it's hard to see a difference in magnification <30x between eyepieces.
That means the 15mm and 12mm are essentially duplicates.
And you certainly don't need a 20mm for in between the 26mm and 15mm.
A constant magnification change could be: 24mm, 12mm, 8mm, 6mm, 4.8-5mm, 4mm.
26mm is close enough. I don't think you need the 15mm, though having an "extra" eyepiece is OK.aperture stop if they can only dilate to 5mm. Fortunately I'm not that old yet and can still find a 6mm exit pupil useful.
I still find exit pupil increments at the long end and focal length increments shorter than 2mm exit pupil to be a better principle for optimizing by object and sky conditions both. Constant magnification increments might make an adequate minimalist set but it won't optimize performance. YMMV.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: New higher power eyepiece for my scope. Suggestions?
I just wonder how well it works withJones wrote: ↑Thu Jul 22, 2021 5:05 pm Forget everything everyone has told you.
You must get the TS Optics UWA 82 degree eyepieces.
You get the big field but these are better on the planets than the Televue Delites. The only things better are the Takahashi TOE's 52 degree for the planets. There are similar ones but they are not nitrogen charged and are a little less good.
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
I don't suffer from insanity. I'm enjoying every minute of it.
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Re: New higher power eyepiece for my scope. Suggestions?
That's the catch. I already have 26 mm, 15 mm and 6 mm. 5 mm is ordered, but it hasn't arrived yet. Well, I also have 25 mm and 10 mm, but they are the cheapest Kellners I could find (my very first EPs), so I'm not considering them as part of my set any more. Just haven't removed them from my signature yet.Bigzmey wrote: ↑Thu Jul 22, 2021 7:33 pmLooks reasonable. There is a bit of redundancy, but since your 6mm and 15mm are minimal glass 50 deg EPs having 12mm and 5mm wide field long eye relief EPs would still be useful. Alternatively, you may decide to split the difference between 15mm and 6mm and get just oneturboscrew wrote: ↑Thu Jul 22, 2021 3:36 pm So, like this?
Code: Select all
focal length magnification exit pupil 26 46 6.50 20 60 5.00 15 80 3.75 12 100 3.00 8 150 2.00 6 200 1.50 5 240 1.25 4 300 1.00
EP in the middle (10-11mm).
Also, I made a poll on the biggest Finnish astronomy club ( https://www.ursa.fi/english.html ) about the maximum useful magnification. According to them, it's about 250x. 300x very seldom, so I decided to get a 5 mm (240x) eyepiece.
(There are not so many 4.8 mm eyepieces around to select from.)
Also my 3x Barlow is the cheapest I could find (got it together with the Kellners).
My idea was going ad hoc with the current good EPs and taking into account both magnifications and exit pupils.
The purchasing order and time are another matter.
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
I don't suffer from insanity. I'm enjoying every minute of it.
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Re: New higher power eyepiece for my scope. Suggestions?
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
I don't suffer from insanity. I'm enjoying every minute of it.
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Re: New higher power eyepiece for my scope. Suggestions?
Not a bad idea. The 15mm will be useful for galaxy hunting.turboscrew wrote: ↑Thu Jul 22, 2021 9:24 pm Would it be bad idea, if, instead of 12 mm and 8 mm, I'd get only 9 mm (133x, 2.25 mm exit pupil)?
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Re: New higher power eyepiece for my scope. Suggestions?
That would work. Are you thinking 9mm Delite?turboscrew wrote: ↑Thu Jul 22, 2021 9:24 pm Would it be bad idea, if, instead of 12 mm and 8 mm, I'd get only 9 mm (133x, 2.25 mm exit pupil)?
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: New higher power eyepiece for my scope. Suggestions?
I wasn't thinking anything specific. But I came to realize, there are not too many good 9 mm options.Bigzmey wrote: ↑Thu Jul 22, 2021 10:59 pmThat would work. Are you thinking 9mm Delite?turboscrew wrote: ↑Thu Jul 22, 2021 9:24 pm Would it be bad idea, if, instead of 12 mm and 8 mm, I'd get only 9 mm (133x, 2.25 mm exit pupil)?
Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5
I don't suffer from insanity. I'm enjoying every minute of it.
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Re: New higher power eyepiece for my scope. Suggestions?
https://www.cloudynights.com/topic/7583 ... p=10917573
As for selecting by exit pupil, lots of discussions suggest a 40% difference might be optimum. Less than that, and the brightness difference might not be noticeable.
If we start with a 6mm exit pupil, the exit pupil progression is: 6.0mm, 4.6mm, 3.6mm, 2.8mm, 2.2mm, 1.7mm, 1.3mm, 1.0mm, 0.8mm, 0.6mm
Now that may be a bigger set of eyepieces than you want, and it will put the eyepieces really close together in magnification at the low end.
If all your eyepieces have the same apparent field, you can get smooth decreases in field area of 50% between eyepieces by dividing the focal lengths by 1.414
To wit: 30mm, 21.2mm, 15.0mm, 10.6mm, 7.5mm, 5.3mm. We can round off to a set of 30, 21, 15, 11, 8, 5mm, a 6-eyepiece set.
There are many ways to choose eyepieces. And if you buy too few, buy another. Too many? Sell one or more.
One truth: you cannot buy a set of eyepieces today you will find optimum in 10 years. So just take the plunge.
Currently using a 12.5" dob and a 4" apo refractor
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