Quote:
Originally Posted by alpal
OK - I was just reminded of something else:
Is it true that you can't take long sub frames with CMOS sensors due to AMP glow?
If so then that's a problem with narrow band as a 3 minute subframe
hardly gives you any signal.
cheers
Allan
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It is not really the case. 5 minute subs for instance on my ASI294 will produce a noticeable glow in several locations, but darks calibrate it out. You could do the same for ten minute subs but that just led to too many blown out areas in most images so I generally don't go that long.
The glows look hideous in isolation on a stretched sub (Light or dark frames) but if you don't stretch the data you literally end up looking at a black screen in the case of darks and the master darks generated subtract the glows effectively.