M82

A LRGB image with an Ha blend into both the L and Red channels.  The image represents about 27 hours integration time. I was pleased with the result.

The Ha data, which represents about half the integration time, contained less than perfect subs, however, since I had quite a lot of them (33) and the Ha was quite faint, I decided to go for an aggressive data rejection approach using the Poisson algorithm, the alternative would to have retained only the best quality subs.  I decided to configure CCDstack to allow up to 26 rejections in a 33 pixel stack - which gave a good result. 

LIGHTS: L: 19, R:12, G:18, B:16 x 600s, Ha: 33 x 1800s. DARKS:30, FLATS:40, BIAS:100 all at -20C.