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Old 13-03-2013, 05:17 PM
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Geoff45 (Geoff)
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Geoff45 is offline
 
Join Date: Jul 2006
Location: Sydney
Posts: 2,631
I use a bahtinov mask to get close and then refine with the FWHM monitor that comes with CCDInspector from ccdware http://www.ccdware.com/products/. It reads out your FWHM in real time.
Geoff
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