Low light bins

[Peter Shute <>]

It seems obvious that there's no point having binoculars with a exit pupil 
bigger than your own. The extra light should be wasted because it doesn't even 
enter your eyes.

But I once read a forum posting that suggested this isn't the whole story. The 
poster (an astronomer) claimed that because a larger proportion of the light 
transmitted through binoculars enters them through the central portion of the 
objectives than the outer portion, big ones are brighter even for small pupils. 
I don't understand it, and it could be nonsense, but it's worth checking for 
yourself before abandoning big binoculars.

Peter Shute


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