I was able to make this image composition, since I have shot this target with several focal lengths during years.
Instruments used from top to bottom:
Canon EF 200mm f1.8
Sky Watcher 80mm ED, 600mm FL
Meade LX200 GPS 12" about 2000mm FL
An experimental 3D-stereo version can be seen here:
http://astroanarchy.blogspot.com/2011/01/ic1805-ic1848-as-stereo-pair-3d.html
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