[ATM] astigmatism as seen via ronchi?

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

If you see the lines on a more-or-less spherical mirror in a ronchi view as looking more or less like this:  //////   when you are outside of the center of curvature, and then more or less like this:  \\\\\ when you are inside the center of curvature (or vice versa), does that mean you have really bad astigmatism?



Guy Brandenburg, Washington, DC
My home page on astronomy, mathematics, education:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
or else 
http://tinyurl.com/r6fh2

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