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post #3 of Old 06-23-2013
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Re: Binocular Conundrum: Field of View?

Originally Posted by hellosailor View Post
Take two sets of binocs, 7x50 or 10x42 or whatever you choose. Same size objective lens, same magnification, and same size exit pupil as well.
Not at all. The first product has a magnification of 7x v. 10x in the second. Not the same. Lens on the first is 50mm v. 42mm on the second. Exit pupil on the first is a bit over 7mm while the second is only 4.2mm. Huge difference, particularly in low-light.

So if you're looking for good low-light performance on a bouncing boat 7x50s are a good choice. If you are on a very stable platform and have lots of light and are interested in more magnification than 10x42s are a good choice.

sail fast and eat well, dave
S/V Auspicious
beware "cut and paste" sailors.

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