Messier 81 2013 March 02–14

This is an LRGB image with the L from a light pollution filter, but it is rather undersaturated as the data is dominated by the luminance; true RGB from such a light-polluted environment  as I work in is probably impossible. It was taken over three nights.

Processing was with Deep Sky Stacker and Photoshop (with Gradient XTerminator & Neat Image plug-ins playing a role).

The slight non-roundness on the star images is probably due to chip non-orthogonality, which needs fixing. (Click to enlarge)

Messier 81

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