According to this:
https://www.facebook.com/QHYCCD/post...7635110006430/ - allegedly no amp glow for 300 sec dark, so that's not bad - certainly much better than for the ASI1600 sensor. Wonder what it will be like at 10, 15, 30 min?
I've found that it's no real problem dealing with the amp glow in the ASI1600 with 10 min images, so if this much less, perhaps those longer exposures might be possible. For me, I don't mind the larger number of frames required with shorter exposures - processing power is fairly cheap these days.
Edit: I fell into the "trap" of wandering off topic with everyone else. I suggest move the sensor/camera discussions to their own threads and move back to the original aim of this topic. I think it would be worthwhile to hear other alternatives to what's been suggested, or other things that may not have been considered so far.