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M81 and M82

9 x 4m subs, Minolta Dynax D7, Orion Skyglow SCT filter, Baader Alan Gee II Telecompressor, guided with SPC900NC with B/W chip modification and PHD. Processed in Deep Sky Stacker and The Gimp.

There is a lot of vignetting caused by the Skyglow filter moving the CCD too far away from the focal reducer flattener. If I don't use the filter I only get orange skies.

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File information
Filename:M81_M82_20080320_Beckenham_pf_fr63_iso800_2.jpg
Album name:Duncan / Messier Objects
Rating (2 votes):22222
Link-words:Messier / Galaxy / Duncan
Image date, time and location:Saturday 21 March 2009 02:00am Beckenham
Telescope aperture and focal ratio:Meade LX90 200mm f10 reduced to f6.6
Camera and filters used:Minolta Dynax D7, Orion Skyglow SCT filter, Baader Alan Gee II Telecompressor
Processing applied:Minolta RAW files processed in Deep Sky Stacker and The Gimp
Filesize:427 KiB
Date added:Mar 22, 2009
Dimensions:1655 x 1991 pixels
Displayed:160 times
URL:http://gallery.orpington-astronomy.org.uk/displayimage-733.html
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