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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12600
Loc: Cumberland, R I , USA42N71.4W
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Re: Nagler-like performance...
05/08/08 01:10 PM
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I've now have test data on 7 different 7x50s. The Prostar has an Afov of 53°. None of the other 7x50s are wider than that. Most of the others are between 52° and 49° and this is normal for a 7x50. One of them has a 45° Afov.
The Prostar 7x50 also has the widest Tfov of all 7x50s tested. It's not until you get into 8x binoculars that you start seeing wider Afov eyepieces and Tfov wider than 7.0° to 7.5°. But even with that, in fact only 3 out of 11 of the 8x binoculars that I've measured have a wider Tfov than the Prostar 7x50.
FWIW, I just checked my data files. 19 out of 36 small binoculars tested have Afov 54° or smaller. 14 of them have a narrower Afov than the Prostar. Prostar is just about right in the middle of Afov and is near the top in Tfov of 36 different binoculars tested.
So as it turns out, in the grand scheme of things, the Prostar Afov of 53° is NOT really all that narrow compared to many other binoculars ranging from 7x to 12x, and as far as comparison to 7x and 8x binoculars, it has a wider Tfov than 3/4ths of all 7s or 8s I've measured.
edz
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