20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
-DannyMy warehouseMy Channel
Refractors Reflectors Two Cats A few eyepieces
Quote:Blood red and patterns in the dust clouds unlike I have seen even in pic very steady air. I think the mirror was a f3.7 Lockwood
Quote:Good collimation and a coma corrector?
Mike Lockwood - Owner, Lockwood Custom Optics. 20" F/3 MX Starmaster, 14.5" F/2.55 self-built Newt., nine self-built scopes, 4.25" to 30" http://www.Loptics.com/
Astronomy educator/Sidewalk astronomer
Owner of Astronomy Delight franchise
18 inch f4.42 Dob on eq platform w ST120 f/5 finder
12 inch Zhumell Dob
8 inch f/6.9 home made Dob with Seevers optics
William Optics red 10th Anniversary 80mm FD
C8 XLT on Vixen GPDX
26lb eyepiece box
Cernan Space Center astronomer
Member of Northwest Suburban Astronomers
Quote:Could you see color in the Orion Nebula? I've heard many can see 'green', and in the larger scopes even blues and a bit of red ... just curious ...
Celestron 8SE Dobstuff 13.1": Swayze refigured Coulter mirror, 6 pt mirror cell (2 pt edge support) and CF focuser board made by me StarBlast 4.5 ST80/PortaMount II Zhumell 20x80/Oberwerk 15x70 on a Seronik-style tripod boom mount Hubble Optics 18 inch F/4 mirror.
Quote:Google "Purkinje effect" (it's pronounced Pur-Kine). It's all there, explained better than I can.Mike
Quote:Quote:Google "Purkinje effect" (it's pronounced Pur-Kine). It's all there, explained better than I can.
Doesn't seem to address the issue. It discusses the process of extinction of color vision as light levels drop to "night-time" levels.
The question is the apparent contradiction between the claim that extended objects have the same surface brightness regardless of aperture (with the same exit pupil); and the claim that large aperture telescopes allow seeing color in extended objects that are absent in smaller scopes.
One possibility is that there are brighter regions within the Orion Nebula that become magnified in a large scope to the point that they become visible and can thus generate color perception.
Quote:Google "Purkinje effect" (it's pronounced Pur-Kine). It's all there, explained better than I can.
Quote:I have a 26 inch and there was a good 25 there but the views in the 32 was not expected. Al's coma corrector or something