This image is my deepest view so far of M51. About twelve hours total exposure time, but it represents much more telescope time because I’ve discarded many hours worth. The night before last, for example, out of five hours total time I dumped four, because after I went to sleep fog rolled in, and all the exposures were flat gray.
A close crop:
The dark red coloration is consistent with images on the web, so I presume it is a reflection of reality.