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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12792
Loc: Cumberland, R I , USA42N71.4W
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Re: help with ep's for binoviewing
08/31/08 02:35 PM
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See the resources link and read the posts on Clear Aperture. FWIW, there are no 22mm binoviewers. All of them have a prism aperture of 20mm. Some of them refer to that as 22mm clear aperture because the they are referring to it by the general size of an eyepiece field stop that it will illuminate.
edz
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