Quote:
Originally Posted by Starkler
Col when you step back from the eyepiece and look at it you will see a donut shaped circle of light. Thats an image of the primary mirror and the hole in the middle is the image of the secondary. The size of that image is whats called the exit pupil size.
The amount of the primary mirror been seen and used is ALL OF IT regardless of magnification if the secondary mirror is sized correctly and your eye can fully accommodate the exit pupil.
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oooops!
You mean I was looking at images of the prmary mirror not the light cone coming out... - I think I need a picture with extended objects
sigh
