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Chris
I use a ASI183MM pro at -20deg. This should be similar though. One thing I have found that you can not scale darks with this CMOS camera (or any CMOS maybe?)
The darks have to be identical exposures. I use exposures ranging from 20 secs to 600secs and they all seem to be able to completely remove the amp glow.
I have attached 2 images. The first is a 600sec unprocessed exposure of a spectra. Only the middle section of the image has any light reaching the sensor so all of the radiating rays are caused by amp glow.
The second is a stack of 3 x 600sec exposures processed for the spectra. This means that most of the frame is just no signal. It is heavily stretched but there is no evidence of the amp glow left. There are other faults obviously but these are not relevant to me as I'm only sampling the spectra.
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