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yes, I thought there'd be a difference. I think the histogram method makes sense as it applies to dslr's without much complication. I had a look at your image's histogram in astrobin and it was about 20% from the left which I think was a good thing. but I guess you'd have to check the histogram of an unprocessed sub to be sure.
I reckon your snr would be better with deeper cooling like the jtw and central ds cooled cams but that's another topic.
Cheers
Alistair
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