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Historically, and through a number of tests by people like Craig Stark, Canon DSLRs perform best at ISO 800, so i'd forget shooting below that uness its the Moon. I shoot everything at ISO 800 and have no complaints.
Look carefully at your darks and include bias/offsets in the stack. Accurate guiding is essential I believe, regardless of sub time I always guide.
Now that its winter and the camera will be cooler the darks shoukd improve, make sure you allow a delay between subs for the sensor to cool. Craig Stark has an excellent write up on Canon dark noise comparisons - worth a read. Recent tests by RCheshire and myself using our cold finger cooled Canons show virtually no noise when the sensor temp reaches 0C, basically the darks look just like bias/offset frames so no more dark stacking needed. Cooling is extreme for most folks but mentioned to show Canons can be very low noise, especially on these cold winter nights. Let the camera cool down to ambient if you can-
Last edited by glend; 06-06-2015 at 02:18 PM.
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