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ronharper
Pooh-Bah
Reged: 02/14/06
Posts: 1034
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Re: Prism leakage concerns
07/01/08 10:26 AM
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I haven't a clue, but I've wondered about this, too.
Even though they have very well-blackened interiors, my Fujinon FMTs show leaks around the exit pupils when held up to a bright sky. These three binos range from excellent to only so-so in suppression of glare from bright light outside the field of view. Despite some unblackened matte-finished aluminum inside the barrel, my Leica Trinovid shows absolutely no leaks, and good suppression of such glare. So, leaks seem unrelated to internal finish and the glare problem.
If the leaked light is well outside the eye's entrance, as it is in my Fujinons, it's hard to see how it could affect the view. The issue seems to be where the light is coming from. Is this good light that should be focused into the image, or junky light from outside the field of view that we don't want to look at anyhow?
I hope somebody who understands this will explain to us.
Ron
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