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    Re: Request for autocollimator help
    From: Norm Goldblatt
    Date: 2013 Aug 21, 14:42 -0700

    I'm going to approach at a different 'angle'. Autocollimators are used to establish that two surfaces are parallel to each other and/or measure accurately the angle between them. How the crosshairs appear isn't really important. It's mostly cosmetic. Now, if the return reflection from a flat surface (or retroreflector) is rotated with respect to the image of the crosshairs formed by the eyepiece directly, That would be annoying, but not even that is not 'deadly'.

    I agree with Davidson that there's no adjustment, as the angles are strictly determined by the beamsplitting cube, which is very precise.

    So, if you put a flat mirror, focus so that you have a clear view of both direct image of reticle and reflection from mirror, are the axes twisted, or are the two arms of reticle and reflection parallel?
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