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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12568
Loc: Cumberland, R I , USA42N71.4W
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Re: Undersized prisms - the myth
06/18/08 10:34 PM
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Actually Peter, there aren't too many f/6 binoculars. The BT100 is f/6.2. Vixen makes an f/11. There's a few others. Of all the fixed power binoculars I've tested, none were more than f/5.1. Most were between f/3.8 and f/4.2. All the 80s and 100s were between f/4.4 and f/5.1.
For a 100mm binocular to be f/3.5 it would have to be about 12" or shorter. For it to be f/6 it would need to be about 21 inches long, (both not including shields).
edz
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