Thread: Is this field rotation. coma or what?
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Old 17-06-2008, 06:20 PM
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Geoff45 (Geoff)
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Geoff45 is offline 		 
Join Date: Jul 2006
Location: Sydney
Posts: 2,631
Field rotation is caused by improper polar alignment. Everything rotates about the guide star. You can limit it in two ways:
1. Improve polar alignment
2. Shorten exposures
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