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Old 15-06-2018, 06:03 AM
Imme (Jon)
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Join Date: Aug 2017
Location: Kyneton
Posts: 840
Quote:
Originally Posted by kens View Post
How did you assess the dynamic range? The normal way is FWC/read noise
In 12 bit terms at offset 12 and gain 79 (2e-/ADU) it would be 4084/1.1=3712 or 11.858 stops. With offset 21 it becomes 4075/1.1=3704 or 11.855 stops.
You'd have to do a side by side comparison on the same night. For instance, the moon could make a significant difference.
Your mistake in setting the offset is a good reason for it being fixed now. If you set too offset too low you risk clipping to black.
I must admit those numbers are not my own, pulled from reasearching and reading various threads across the internet.....and they seemed to work well on an F5 newt with 2-3 min exposures in a fairly dark sky.
I’ve now moved to an f7 refractor and have found unity gain to be a good setting with 3 min exposures.....but still testing that theory!

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