This is something different. I had M81 and M82 from a C11 Edge at 2800mm, separately. I also did both targets with an SVX152T. This is a combination of these stacked together, but not done as a mosaic. The idea is by stacking on the targets I get the combined integration time and less noise. The M81 was just a bit more time, but for M82 I had quite a lot of additional time.
What I also got were two ugly rectangles from different sky backgrounds. As I was giving up, @eigenVector was kind enough to provide some multi-scale magic that got me going.
The background has about 41 hours, M81 collectively then only 48 hours, and M82 about 90 hours.
This was taken almost entirely from my B-7 back yard, with one night on the 152 at a B-3 site at Big Cypress.
Please do consider looking at the SVX152T (only) version at 1200mm:
https://www.astrobin.com/q1ovbu/
Comments