Quote:
Originally Posted by The_bluester
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.
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Hi Paul,
I don't know about CMOS.
Here is a
30 minute Ha single frame with my KAF8300 mono - QHY9M.
Field rotation wrecked it as I didn't set up the polar alignment accurately enough
but it was very satisfying to get a good photo with one exposure.
This is a linear stretch in NASA FITS liberator and
only one small adjustment in Photoshop curves.
You can't do that with CMOS can you?