To: <>
Subject: Binoculars
From: "Paul & Irene Osborn" <>
Date: Wed, 28 Mar 2007 13:12:24 +1000
> To work this out, multiply the magnification by the exit lens and square 
> it e.g.  7x42s gives a light value of 36 which lets in alot of light; 
> 10x40s gives a light value of  16 - moderate light; 16x50 gives a light 
> value of 9 - difficult in dark situations. 

Lloyd means divide, not multiply, otherwise his advice is very good.
Paul Osborn


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