Quote:
Originally Posted by gregbradley
One thing I might add which is a bit of an issue with CMOS. None of them have shutters. That means taking darks mean you have to remove the camera (which is extremely sensitive to tilt) and then take darks in a dark location with some sort of cap (the supplied cap is not lightproof).
You also need a larger library of darks for the different gain/offset settings and in the case of QHY, 3 different main types of readout modes.So that is a lot of darks and biases.
I haven't seen any reflections from mine but I use Gen 2 Astrodons and have for years They are expensive but its a one off cost and it gets used over many years with no problems with all my cameras interchangeably.
Are you seeing subtle dark horizontal lines/banding that is random? I haven't seen it a lot but it does seem to only appear in heavily underexposed subs.
I haven't seen walking noise yet either. Again I think its a under exposure symptom.
Greg.
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im curious as to why you need to remove the camera for darks, i did a batch after the short picture provided, just closed up the obs put cap on the scope and went to bed while it ran through the night. will stick to one setting for a while.
would love some high spec filters but budgetry constraints, still you get what you pay for.
noise in the camera.....
i have examined a number of dark frames and from frame to frame there seems to be a completely random pattern to the noise, however if you take a master dark and stretch it a huge amount you can get a pattern, but its not going to be a problem as i have stretched it to the extreme.