A focal length of 500 mm is actually a little short for galaxy imaging, but M106 is rather large and a 180 mm mirror yields a large resolution. Total integration time almost 7 hours (415 minutes). Imaged with the Epsilon-180ED and Canon EOS 5D Mark II (Baader modded) at ISO 1600 (5 min. subs). February 25 & 26, 2017, Les Granges, Étoile-Saint-Cyrice, France (SQM 21.4 - 21.6).
The following images are crops of the actual FOV. Best to view in full-res on my website.