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post #7 of Old 06-23-2013
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Re: Binocular Conundrum: Field of View?

Originally Posted by hellosailor View Post
Same thing. I'm not comparing apples to oranges, I'm saying that it doesn't matter which glasses you compare. 7x50 to 7x50, or 8x42 to 8x42, pick ANY SIZE you want and then compare two different bincos IN THAT SAME NOMINAL SIZE. Whether they are made by the same maker or two different makers, but the SAME NUMBERS on both glasses. As I said, I'm familiar with optics, I know pretty well that a 7x and a 10x will--or at least should--have very different FOVs under most conditions.
Then I'm confused about your confusion. It's all about the angles. For a fixed lens diameter, the longer the optical path the narrower the field of view. Physics is physics. The variables are optical path length, the two lens diameters, and the magnification of each lens. For field of view to change one of those parameters must change also.

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