NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2013 Jan 18, 17:08 -0800
Alex,
Scopes, binoculars, cameras seem to exhibit optical aberrations at the perimeter of the fields of view. Expensive optics are suppose to correct for this. Also I have noticed some fringe effects on sextant filters.
http://en.wikipedia.org/wiki/Optical_aberration
The peep is 1/4 of an inch in diameter. The down side is that the field of view is decreased and this is why I remove it for conventional observations where absolute precision isn't as critical.
Greg Rudzinski
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