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    Re: Lunar distance measurement in ideal conditions: attainable accuracy.
    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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