Hello,
despite a relatively bright suburban sky, the conditions were at best to shoot M51 (Western Europe). I turned off the TEC because mist quickly formed on the protection window of the camera. However, the sensor spontaneously cooled down to 5°C.
Auto dark subtraction with FireCapture (I love that!), no offset, no flat. Only a *** processing to unveil nodosities (I'm not used to process deep-sky images) and to wipe out the remaing offset signal (little banding). I tried 10-s exposures and the offset was conspicious. 15-s exposures drowned it into the background; despite the sky background increased, the signal/noise was better.
However, I think the HII regions are unreachable with such short exposures and my HII, 6nm filter will gather dust for a long time.
Note the very small 15.7-mag, IC4277 spiral galaxy at bottom left, not too bad for a CMOS planetary camera with a FSI sensor! Binning was unnecessary.
Nicolas
