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Here's a 32 minute exposure (32x1min) stacked and flat/dark corrected in DSS. The only other processing is a stretch in StarTools to reveal the background and all the faint stars.
The first image is a highly compressed postage stamp version of the full frame, and the rest are 100% crops of the corners and centre.
Looks like there is a bit of a sensor tilt in the camera, but I think it may not be worth worrying about.
Also this set does not seem to suffer noticeable reflections from off the field stars, but not only bright stars produce reflections and so the image must have some extra photons adding false background brightness.
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