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  1. M

    Daft question about low-light performance

    Gijs; You are quite correct, of course. Yes, I have posted a very embarrassed addendum to post 12, which consisted of "Oops!" I could have done what a very well known poster does, and deleted the post, but chose not to. Richard
  2. M

    Daft question about low-light performance

    The same laws of physical optics apply to, and work the same for all binoculars great and small. The glass with the largest objectives will still be brighter and have a larger exit pupil, for any comparison at a given magnification. A 10X50 will always have a bigger exit pupil than a 6X30...
  3. M

    Daft question about low-light performance

    I believe that you are overthinking a bit. For a given magnification, the glass with the largest objectives will perform best at lower light levels. The size of the exit pupil is an incidental consequence of the relationship between objective diameter and magnification.
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