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My next set of images Tuesday night also had no double images in Dec - so maybe the problem is solved. I guess I'll know after a few more nights.
The image had a little elongation in the RA direction and there was about 3' drift over 1.5 hours - probably from flexure. The image is noisy and I am trying to get out of the habit of darkening the sky to much and clipping the black.
This is about 70 x 60 sec subs, c9.25" F/10 centralds canon 60d @ -16C iso1600.
Things I have done to try to improve the problem:
- increase noise on autoguider to reduce the possibility of a fainter star being picked up.
- offset the RA balance slightly to the East.
- offset the Dec balance to the mirror end.
I need reduce the RA elongation - I suspect it is caused by the guider not properly compensation for PE? I can either increase/decrease aggression or guiding speed - any suggestions (apart from trial and error).
Tony.
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