realflow100 wrote: ↑Wed Jan 22, 2020 6:09 pm
I just cant afford that kind of cost. if a a coma corrector costs more than my telescope might as well just buy a refractor instead that already has great image quality instead of buying a 2" focuser reflector then buying an even more expensive coma corrector for doing imaging with it.
Ive been looking at that post thats where I got the idea from and I want to replicate it. I already ordered the lenses because they were so cheap
Ah, but a short, fast refractor, and an achromat I'm guessing, has its own problem: chromatic aberration; false-colour. Also, the stars would appear not as sharp points of light, but bloated, swelled. Although, the stars would be round nonetheless, for the most part. There may also be some distortion at the edges due to field-curvature, resembling
coma, but perhaps not as bad as that of the 100mm
f/4 Newtonian.
What sort of mount are you using, or are planning to use?
This refractor would be the equivalent to your 100mm
f/4, an 80mm
f/5 achromat...
If you were to consider that one, you'd be paying for the telescope. The manufacturer throws that tripod in essentially for free, and just to get the telescope up off of the ground.
"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