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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 633
Loc: Ottawa, Ontario, Canada
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Re: Some tid-bits obout the 2.3x40 Owl eyes
06/27/08 07:07 PM
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When the rear pieces are removed, the outer barrel can fall off. But the eyepiece assembly itself stays in because it has a multi-start thread for focusing. The outer barrel has a small notch to align with a pin on the eyepiece barrel, which then allows for focusing. The gap under the outer barrel is small, and a tab of tape can be used to provide a good friction fit, and can be placed so that it's invisible.
In case I didn't stress it enough, daub some black paint on the exposed ground edges of the eye lenses. There are two surfaces requiring this:
1) Most importantly, the flat ring which immediately "frames" the ~8.5mm useable aperture, and
2) the conical section outside of this.
This will eliminate the vast majority of annoying scattered light.
There just ain't any room to insert filters behind the eye lens. Moreover, the filter would only force your eye farther back and hence reduce field, and it would be covered with eyelash marks in no time.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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