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I'm trying to get my telescope set up so that it has good collimation and back focus. I was wondering if anyone could give me tips based on the images below. Whilst capturing this object I had a near full-moon on the first night, clouds on the next four nights, moved from a traditional guide cam setup to an off-axis guider on the second night, had a slightly loose imaging train on the third night which would have affected my backfocus and tilt and then tightened and re-collimated on the fourth night. Not ideal, I know, but I've tried to compensate by using a weighting in PI based on 70% PSF SNR Weight, 15% Eccentricity and 15% FWHM. Oh, I also used subframeselector to throw away 15% of the subs based on limits on those three parameters too. The following one is a mosaic from the abberation inspector in PI on that target:  and here is the full image:   M106 after 5 hrs integration |
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He's back in the saddle! Excellent!  |
