A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

Discuss your refractor type scopes here.
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John Baars Netherlands
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A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#1

Post by John Baars »


Everybody knows it. A 150mm Achromat is a widefield telescope with terrible CA. Certainly not suited for observing Jupiter.

When I was doing a bit of deep sky the other night with my 150 mm f/5 Achromat, Jupiter popped up above the far away buildings and trees. Could you resist that? I certainly couldn't. So I aimed for Jupiter...

A Jupiter with a few belts and a pronounced blue rim around it was presented to me. Still.....I was not really impressed by the blue color.
But then, I remembered that the manufacturer had made an lockable 11cm central hole in the cap for......occasional planet observing??
It turns the original f/5 instrument in a 110mm f/6.8 one.
Even as a rather spoiled planetary observer with a 120mm APO I thought it turned out to be okay. Good enough to show when no Reflector or Apo is at hand. Of course I 'll allow all disagreements :lol:

I did not make a sketch. Instead I took an old sketch and tried to turn it with Paint into an impression which came near to it.

Here is the original sketch, with a 4.7 inch APO"
Jupiter latest version, June 2018.jpg
Next the 110 mm f/6.8, stopped down version
Jupiter150mm stopped to 110mm, June 2018 - kopie.jpg
Quite a difference!

There still is a little problem though. Being so low near the horizon Atmospheric Dispersion kicks in. As an example I tried to make an impression of that too. So... to all occasional observers and beginners: if Jupiter looks like this, it is not your telescope, eyepiece or diagonal, it is the atmosphere! Don't worry, within several years the planet Jupiter and Saturn will be much higher up, and much of these colored rims will be vanished by then. Experienced observers use a atmospheric dispersion corrector to eliminate these colors.
Example atmospheric dispersion, June 2018 - kopie.jpg

Enjoy!

( :doh: experienced planetary observers will note I made a mistake. And I am not going to tell which one :naughty: )
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#2

Post by Bigzmey »


Great minds think alike! :D I did the same recently with a custom stop and it improved the views significantly. Now I can honestly recommend 150ST as good all around refractor.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#3

Post by helicon »


I've had a few decent views of Jupiter, mainly a couple of years ago through the 152 achro at powers ranging from 135x to 225x. Of course, nowadays the planet is not in prime observing position. I'll have to look into the idea of stopping down the aperture. Thanks John.
-Michael
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#4

Post by Makuser »


Hi John. My Celestron version also comes with the central stop down cap. However, I did not pursue any of the possibilities by using this. It appears that using this tool greatly helps in some planetary viewing. Thanks for your great input on this John, and the best of regards.
Marshall
Sky-Watcher 90mm f/13.8 Maksutov-Cassegrain on motorized Multimount
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Comet Catcher 140mm f/3.64 Schmidt-Newtonian on alt-az mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Kamakura 7x35 Binoculars and Celestron SkyMaster 15x70 Binoculars. ZWO ASI 120MC camera.
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#5

Post by John Baars »


I figured out that a Baader Moon & Skyglow filter might come in handy to enhance contrasts a little. Natural colors remain better intact than with colored filters.

About the atmospheric dispersion. Even the Sun has to do with it. A perfect example:

Note that the blue/ green rays are at top. Same with Jupiter.
But I forgot in the sketch South was up........so the colors are okay, but the image of Jupiter itself should be reversed 180 degrees.....
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#6

Post by John Baars »


I observed Jupiter and Saturn at full aperture the other night. The first post was about CA. This post is about details.

At full aperture I still could see more details than stopped down to 110mm , even though the CA is bigger.
Jupiter is quite yellow, with blue rims. Nevertheless it shows at least as much big details as a 90mm - 95 mm refractor, maybe a bit more, but..... with obvious contrast loss. Subtle details, like the swirl of a festoon, were seen but ever so dim. On the other hand I could easily magnify to 180X, without mouches volantes, which would normally be seen at that magnification and a 90mm instrument, thanks to the larger exitpupil. This helped a lot on the + side.

To compensate fore the yellow color I added a Baader Moon & Skyglow filter. It bleaches the yellow color, but contrast too.
So in the end I preferred the full aperture.

I had been so busy with it that I totally forgot to use the ADC! Quite stupid :lol: Normally it would add some more subtle details.
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#7

Post by yobbo89 »


very nice report, the only thing i can guess with what you mention that is wrong ,ahh i would guess it to be the angle of the dispersion , everything else looks right north south and p ectt .

from my location , jupiter runs on an angle to my horizon , it might be parrel if you were at the north pole or something :lol: , i use an adc : )
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#8

Post by pakarinen »


I keep forgetting that both my fracs have smaller caps on the main dust caps to stop them down. I'll have to try that.
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#9

Post by Kanadalainen »


Thanks John,

A thoroughly scientific approach. I love the way you break this down and find the best way to use your nice scope for planetary viewing.
Ian

Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4
SCT: C8 Edge f10 or f7 with reducer
Dob: 14.5" homebuilt strut dob (f4.5 ZOC mirror), Nexus II, Moonlite focuser
Mounts - Ioptron Skyguider pro, Astro Physics GTO900
Cameras and lenses - ZWO 2600 mc, 290 mm mini, Canon 60D modded with Rokinon 10mm 2.8; Rokinon 135mm f2

Skysafari 6 Pro, Astro Pixel Processor, Pixinsight - using Mac tablet and ASIair pro to run the AP rig.

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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#10

Post by Greenman »


Hi John, this is interesting as I have just seen a Skywatcher 150/750 for sale for £250. Now on CN and other reviews the scope comes out fairly well in that a semi-apo & fringe killer take out virtually all CA. Unfiltered it’s noted that the CA gets less as magnification increases - is this acting as stopping down the aperture would?

Am I tempted by the scope, well yes a 6” frac has been a dream scope for me, and this is a fairly compact option. Am I going to purchase. Probably not at the moment, but in the future... watch this space (pun intended).
Cheers,

Tony.

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Smart Scope: Dwarf II - Club and outreach work.

AP Refractor: Altair 72EDF Deluxe F6;1x & 0.8 Flatteners; Antares Versascope 60mm finder. ASIAir Pro.Li battery pack for grab & go.

Celestron AVX Mount; X-cel LX eyepieces & Barlows 2x 3x, ZWO 2” Filter holder,

Cameras: main DSO ASI533MC; DSO guide ASI120MM; Planetary ASI224MC; DSLR Canon EOS100 stock.

Filters: Astronomik IR cut; Optolong L-Pro; Optolong L-Enhance.

Binoculars: Celestron 15 x 70.

Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447

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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#11

Post by Bigzmey »


Greenman wrote: Tue Aug 11, 2020 12:54 pm Hi John, this is interesting as I have just seen a Skywatcher 150/750 for sale for £250. Now on CN and other reviews the scope comes out fairly well in that a semi-apo & fringe killer take out virtually all CA. Unfiltered it’s noted that the CA gets less as magnification increases - is this acting as stopping down the aperture would?

Am I tempted by the scope, well yes a 6” frac has been a dream scope for me, and this is a fairly compact option. Am I going to purchase. Probably not at the moment, but in the future... watch this space (pun intended).
This is a very good scope for a very good price! It could compliment nicely your 6" SCT. SCT would have an edge on Moon and planets, but 150ST would definitely outperform 6" SCT on DSOs.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#12

Post by Greenman »


Bigzmey wrote: Tue Aug 11, 2020 8:21 pm
Greenman wrote: Tue Aug 11, 2020 12:54 pm Hi John, this is interesting as I have just seen a Skywatcher 150/750 for sale for £250. Now on CN and other reviews the scope comes out fairly well in that a semi-apo & fringe killer take out virtually all CA. Unfiltered it’s noted that the CA gets less as magnification increases - is this acting as stopping down the aperture would?

Am I tempted by the scope, well yes a 6” frac has been a dream scope for me, and this is a fairly compact option. Am I going to purchase. Probably not at the moment, but in the future... watch this space (pun intended).
This is a very good scope for a very good price! It could compliment nicely your 6" SCT. SCT would have an edge on Moon and planets, but 150ST would definitely outperform 6" SCT on DSOs.
Sigh, I feel a difficult conversation coming on with my missus. Thanks Bigzmey :lol:
Cheers,

Tony.

Image

Smart Scope: Dwarf II - Club and outreach work.

AP Refractor: Altair 72EDF Deluxe F6;1x & 0.8 Flatteners; Antares Versascope 60mm finder. ASIAir Pro.Li battery pack for grab & go.

Celestron AVX Mount; X-cel LX eyepieces & Barlows 2x 3x, ZWO 2” Filter holder,

Cameras: main DSO ASI533MC; DSO guide ASI120MM; Planetary ASI224MC; DSLR Canon EOS100 stock.

Filters: Astronomik IR cut; Optolong L-Pro; Optolong L-Enhance.

Binoculars: Celestron 15 x 70.

Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447

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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#13

Post by Greenman »


Greenman wrote: Wed Aug 12, 2020 10:55 am
Bigzmey wrote: Tue Aug 11, 2020 8:21 pm
Greenman wrote: Tue Aug 11, 2020 12:54 pm Hi John, this is interesting as I have just seen a Skywatcher 150/750 for sale for £250. Now on CN and other reviews the scope comes out fairly well in that a semi-apo & fringe killer take out virtually all CA. Unfiltered it’s noted that the CA gets less as magnification increases - is this acting as stopping down the aperture would?

Am I tempted by the scope, well yes a 6” frac has been a dream scope for me, and this is a fairly compact option. Am I going to purchase. Probably not at the moment, but in the future... watch this space (pun intended).
This is a very good scope for a very good price! It could compliment nicely your 6" SCT. SCT would have an edge on Moon and planets, but 150ST would definitely outperform 6" SCT on DSOs.
Sigh, I feel a difficult conversation coming on with my missus. Thanks Bigzmey :lol:
Oh Well, that went as anticipated, on to Ebay for me time - clear out my spare stuff. :D I have to be fair I have spent out this year. But god loves a trier :lol:
Cheers,

Tony.

Image

Smart Scope: Dwarf II - Club and outreach work.

AP Refractor: Altair 72EDF Deluxe F6;1x & 0.8 Flatteners; Antares Versascope 60mm finder. ASIAir Pro.Li battery pack for grab & go.

Celestron AVX Mount; X-cel LX eyepieces & Barlows 2x 3x, ZWO 2” Filter holder,

Cameras: main DSO ASI533MC; DSO guide ASI120MM; Planetary ASI224MC; DSLR Canon EOS100 stock.

Filters: Astronomik IR cut; Optolong L-Pro; Optolong L-Enhance.

Binoculars: Celestron 15 x 70.

Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447

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Re: A 150mm f/5 Achromat stopped down on Jupiter, just for fun.

#14

Post by Bigzmey »


Greenman wrote: Wed Aug 12, 2020 12:15 pm
Greenman wrote: Wed Aug 12, 2020 10:55 am
Bigzmey wrote: Tue Aug 11, 2020 8:21 pm

This is a very good scope for a very good price! It could compliment nicely your 6" SCT. SCT would have an edge on Moon and planets, but 150ST would definitely outperform 6" SCT on DSOs.
Sigh, I feel a difficult conversation coming on with my missus. Thanks Bigzmey :lol:
Oh Well, that went as anticipated, on to Ebay for me time - clear out my spare stuff. :D I have to be fair I have spent out this year. But god loves a trier :lol:
Consider it not spending money but investing. :D
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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