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As requested, attached are jpgs of re-scaled (30% original size) old single 15-minute dark frame at -20 C and surface plot (after significant stretching to highlight Sony glow) and a new single 15-minute dark also at -20 C with the same stretch applied plus surface plot of the stretched dark.
I double checked the numbers and actually Average Dev for the old dark (entire sub) was 20.0 ADU, while for the new one is 11.2 ADU. Not sure why I got different numbers for the same subs yesterday - I verified the values above with STDev for smaller areas in the subs.[/QUOTE]
Thanks for that. Those darks look very very clean.
Greg.
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