[tim.anderson (Tim Anderson)]

I have been doing some imaging with an ASI1600MM-C camera and have noticed that there are hot pixels appearing in the light frames that do not appear in my master dark, even when I construct a master dark less than an hour before starting an imaging run (the master dark is constructed from >30 dark frames run at the same exposure and temperature as I use in the imaging run).

That is to say, the master dark removes a large proportion of hot pixels from each light frame, but not all of them. As a result, the additional hot pixels then show up as coloured smears throughout the stacked image (see attached pic).

Can anyone tell me if this is normal behaviour behaviour for this camera or do I have a dud? If it is normal behaviour, how do I get rid of the artefacts?

Any help appreciated.