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Is there even the most remote possibility of finding a 1.25 coma corrector for F4 newtonian/dob reflector 100mm aperture. 400mm focal length
Is it possible I could make one myself at all? I can order lens elements from some websites (doublet. triplet or even quadruplet) various lens types. concave convex plano convex plano concave biconvex. and even custom ones. for reasonably cheap
under 100$ for a few lenses together.
I can fit them in some eyepiece filter threads to work.
Is there any at all available to purchase on ebay or something for 100$ or less?
I'm not spending double or more the price of my telescope just for a coma corrector. it'd be better value to just buy a bigger telescope in that case.
but the coma is INSANELY severe with my telescope around the edges.
Svbony SV503 70mm ED F6 420mm FL refractor telescope (New)
Canon EOS 100D/SL1
Tamron 18-200mm F3.5-F6.3 II VC lens
canon 50mm STM F1.8
svbony 8-24mm zoom eyepiece
svbony goldline 66 degree 9mm and 6mm + 40mm plossl + 2x barlow.
svbony UHC 1.25 filter + astromania 1.25" O-3 filter + also an svbony H-B filter.
I can only think of two companies worldwide, possibly three that would be able to make one.
Cheap would definitely not be in the description though as these would be custom made and working out glass type/ curve/ spacing takes time, then it would need to be coated and a custom cell made etc. Not a cheap endevour in any sense.
Coma is going to be an issue with any fast Newtonian no matter the aperture so you may want to use what you have in the meantime while you come up with a reasonable equipment list to advance toward and save your money in the meantime to purchase it.
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885 EQ: TAL MT-1, Vixen SXP, AXJ, AXD Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis 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, Takahashi prism, TAL, Vixen flip mirror Eyepieces: Antares to Zeiss The only culture I have is from yogurt My day was going well until... people
I know it sucks but no point in getting your hopes up.
Just for an example I had a 46mm clear aperture 1.3x extender made for my Vixen 115mm to operate at f/10 instead of its native f/7.7, by the time it was in my hands it was just under 400€ ($440USD) and making an extender is much simpler overall than a coma corrector.
You have been getting some good images using your camera with the mount, practice using it and your current telescopes for now and get good at using them.
When you can afford better equipment all of that practice will make it easier for you to use the new stuff and then you will be explaining to people starting out how to use their equipment
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885 EQ: TAL MT-1, Vixen SXP, AXJ, AXD Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102 Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror Eyepieces: Antares to Zeiss The only culture I have is from yogurt My day was going well until... people
I will be in possession of a new lens (not telescope!) saturday! And on sunday I will have a dovetail L bracket adapter to directly attach my camera to my goto star tracker!
55-250mm IS II zoom lens! bought both for under 100$ total
I also have a 0.43x wide angle filter adapter if I need it for some reason to get wider angle. and also a 2.2x telephoto filter adapter to get 500mm-ish focal length if I need to!
so I got some good options now without a telescope once the new camera lens arrives
Svbony SV503 70mm ED F6 420mm FL refractor telescope (New)
Canon EOS 100D/SL1
Tamron 18-200mm F3.5-F6.3 II VC lens
canon 50mm STM F1.8
svbony 8-24mm zoom eyepiece
svbony goldline 66 degree 9mm and 6mm + 40mm plossl + 2x barlow.
svbony UHC 1.25 filter + astromania 1.25" O-3 filter + also an svbony H-B filter.