calibrate and register the sub
exposures and create the RGB image..
processing includes registering and stacking the luminance, gradient repair
and non-linear stretching.
the LRGB combine and final touch up.
North is to the bottom. I think it looks better upside down.
Messier 67 is one of
the oldest known open star clusters. M67 contains over 500 stars and
lies about 2,800 light-years away in the constellation Cancer. At
that estimated distance, the cluster would be about 12 light-years