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Possible mount issues...?
Here's two shots from last night, one edited heavily and one relatively untouched from the resulting TIF from DSS. I shoot with a cheap DSLR through flattened ED80 on a NEQ6, unguided (with no PEC), 20 subs at 2 mins 30 seconds.
I used darks and too low an ISO so the luminance isn't really strong enough but the issue remains - the stars aren't just elongated, they're sliding back and forth resulting in these weird little lines with the brightest point in the middle.
Is this a characteristic of a mount that needs stripping down and regreasing? That's my best guess. On some 2-min subs the other night I noticed that every 3rd or 4th sub was blurred in one direction or the other; with these slightly longer subs it seems to be every 2nd or 3rd. I used all the subs for this image just to see what DSS would do with them; the fact that the strongest part of each star is in the middle suggests to me that the mount is going back and forth. Someone suggested a bit of grit in one of the gears could do that.
Thoughts?
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