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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12600
Loc: Cumberland, R I , USA42N71.4W
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Re: Does aperture rule in bino land?
12/07/05 10:07 AM
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You would get different results if you tried comparing masking views under mag 6 skies, mag 5 skies and then mag 4 skies. Under mag 6 skies, you would probably see more of almost everything with the larger aperture. Under mag 4 skies you would probably wouldn't see any more of anything with a larger aperture at the same magnification, and you would probably lose sight of faint extended objects at your contrast threshold because the background sky would appear so much brighter the image would get washed out.
Tests I've done show under a mag 4.5 sky a 10x70 and a 10x50 reach nearly the same limiting magnitude. However, under a mag 5.8 sky the 10x70 reaches about 0.8 magnitude fainter. The LM gain due to aperture is a lot more significant as sky gets darker.
edz
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