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Tonight I am playing with 1800 sec, 2400 sec right up to 3600 second subs - and the results look pretty good so far. I selected ISO 400 after reading an article Craig Stark wrote on how the Canon processes its raw files, seems like it does some sorts of non linear adjustment to address dark current that isn't simple. ISO 400 works well for me so far.
So having now about 24 hours of light frames on M20 its time to tweak the processing and move onto something new!
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