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Re: (SNES) Object Brightness

I would think the surface brightness of extended objects in both scopes would be the same since the magnifications would be equal. Since the exit pupil is equal to about 2 mm in both cases, there is no problem with the light cone entering the normal eye. The field or sky background brighness could also be considered to be just an "extended object", the same would apply -- both equal. 

Anyone have a different derivation?

 Bob N.



From: "Ernest R. Evans" <pilotstar@mindspring.com>
Reply-To: snegazers@brainiac.com
To: snegazers@brainiac.com
Subject: (SNES) Object Brightness
Date: Fri, 10 May 2002 13:00:16 -0400

Would appreciate some feedback on this:

Would an extended object (e.g., nebula,  galaxy) appear to have the same
brightness to the eye when viewed through an f/8 scope with a 16mm
eyepiece as compared to an f/4 scope of the same aperture using an 8 mm
eyepiece? (Assume quality optics.) How about the field background light
brightness in the eyepieces in such a comparison?
Thanks,

Ernie
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