Quote:
Originally Posted by gregbradley
Thanks Slawomir.
I think it depends on the CCD used. The KAF16803 has over 100,000 electron well capacity as opposed to the Sony ICX814 which has about 12,000. So you'd have to monitor the brightnesses. Take an image and check the ADU numbers as you move the cursor over bright parts of the image. You start seeing a lot of 65,535 that means you are overexposing.
There's no set exposure length but individual best exposure for that particular CCD being used.
Greg.
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I checked and maximum ADU numbers for this nebula in 2-minutes subs in my photo are under 5000 units (except for bright stars that are already at maximum ADU), so it looks like I could go for much longer subs - will try it one night and see if I can capture fainter nebulosities like in your image
Thank you Greg for explaining that.