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Message: <blockquote data-quote="Howard220" data-source="post: 1547754" data-attributes="member: 22042">A 16x50 gives you a 3.125mm exit pupil, whereas a 15x70 gives a much larger and more comfortable (as far as I'm concerned) 4.17mm one. (3.125 is perfectly adequate for daytime use.) And in case you were to use them for astronomy, note that a 16x50 will not gather as much light as any 15x70, as a 70mm objective has just about twice the physical area of a 50mm one. That's a big difference.But the 16x50 may be a lot easier to use just because it is smaller, and you may enjoy using it more than your old 15x70's.</blockquote>