Low light bins

To: "" <>, "" <>, "" <>, "" <>
Subject: Low light bins
From: Peter Shute <>
Date: Wed, 9 Mar 2011 10:15:22 +1100
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

Sent using BlackBerry

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU