David's Astronomy Pages Notes - Session 512 (2012-08-03)

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	2012-08-03
	Impact of having an up-to-date flat field on final image (M101)
	Images from 2012-08-03 >>

Impact of having an up-to-date flat field on final image quality (M101)

Annotated CCD Image  of M101 with with supernova 2011fe  (Ursa Major) (58% size, cropped) 5 x 60 sec exposure (average combine), 3x3 binning, C Filter  2012-08-03 22:26 h UT  (#512215-19) 12" LX200R  (at f/9.7) + ST-10XME
Left hand image with out of date flat field (two particular artifact are noticeable due  to altered or invalid dust motes )		Right hand image with updated flat field (improvement in image is noticeable)
Old Master Flat (50% size) 3x3 binning, C Filter, 17 x 1.5s (Av. Median) , S491		New Master Flat (50% size) 3x3 binning, C Filter, 21 x 1.5s (Av. Median), S515

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