The camera is SOOOO much more sensitive and faster with downloads than the SBIG - focusing was such a snap, aligning, etc. Wow.
I wanted to try M31 as my first attempt because it was a new moon night and I was just going to use an L-pro filter, but framing was pretty tight in the AT72 (I just have a flattener, here I definitely need a reducer which is currently OOS at Astronomics).
I don't know how to really figure out a good exposure time, so I just picked 2 minutes and planned to do a lot of them. The plan was working for a little over an hour until the sky became a really soupy, hazy mess, and all but the brightest stars (and Mars) were wiped out. Oh well...so here's 45 2-minute exposures calibrated with flats (probably not great ones), bias, and darks.
In the bottom right and top left are these regions where the background illumination seems...hazy? As if there are variations in the brightness? It may be kind of hard to see here because I tried to hide that in processing.
I've also got these random little speckles here and there that are red, green, or blue. Are these stuck pixels? What's the best way to handle them?
Also, even though the camera comes with precisely 55mm of spacing, it looks like the AT2FF flattener needs a bit more...