This is a hair under 7 hours of data on the Coma cluster (41x10m frames and an additional 470s frame) with my Canon 6D at iso 400 through a Televue 127is at f5.2. I calibrated with dark, flat and bias frames, and stacked/processed in Pixinsight. There are more than a few galaxies in the frame, so I am attaching an annotated image to accompany this.