Thread: Shim
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  #3  
Old 21-09-2015, 05:55 PM
raymo
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Join Date: Sep 2011
Location: margaret river, western australia
Posts: 6,070
With your setup polar aligned, do a few exposures of 2, 3, 5, 8, and 10 sec. With even reasonable polar alignment stars will not elongate in
such a short time. If all your resulting pics show the stars equally elongated then your camera is almost certainly not perpendicular to
the light path.
raymo
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