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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 703
Loc: Ottawa, Ontario, Canada
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Re: Advantages of 10x50 over 8x42?
07/07/08 08:13 PM
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For astronomical use, this very simple formula presented and discussed in the RASCs's Observer's Handbook tells the tale:
Binocular performance = objective diameter times magnification.
8 X 42 = 320
10 X 50 = 500
So the 10x50 could be characterized as being 500 / 320 = 1.56 times, or 56% better.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
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