[masraum]

Originally Posted by tevake

From my boating days I hung onto a pair of Fujinon 7x50 binocks that are heavy but oh so good. Had a nice but cheap pair kept at hand for most use, but in low light the Fujinon pair were just night and day better. Really good at making the most of the available light. Remarkably better.
That quality may be usefull in hunting a application, but am not sure what the specs are that indicate superior low light capability.

Cheers Richard

The average person's pupil can dilate to 7mm in the dark. From what I understand, as you age, that usually decreases. The "ideal" binocular (for low light purposes, like astronomy) has an exit pupil that matches what your eye can dilate to. 7x50 is considered pretty ideal in the astronomy crowd for a good all-around binoc because the exit pupil is roughly 7 (50 divided by 7). In bright light, that's clearly not as important, but if you had something that was 10x25, those would obviously give up a lot in low light performance to something like a 7x50 or even 10x50 or 8x42.