[Lee]

Getting there! slowly....

Last night I decided to push the G-11 a bit more than I had, with 2min exposures, at NGC1365. Initially tried the Helix Neb, but couldn't get it to appear at all!
This image is 10x2min exposures. The black trailing dots appeared upon the final stretches. I am assuming this is likely from dark frame temp mismatch. The darks I took last week I'm sure were 2 degrees warmer than what last night was (30 degC vs 28deg C CCD temp).

Is this the likely culprit?? The trail of the dots would be indicative of how far the image drifted on the CCD over the 20 min.