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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 703
Loc: Ottawa, Ontario, Canada
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Re: Pentax 20x60 PCF WP II (Prisms undersized)
06/30/08 08:00 PM
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Quite often I've seen this phenomenon of field stop circles overlapping, even when looking out to infinity. It indicates that the eyepiece optical axes are tilted with respect to each other. When the instrument is collimated so that comfortable merging of the images can be accomplished, the eyepiece tilt is well revealed as overlapping field edges. I find this to be an intolerable problem.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
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