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Hi Justin,
I did try a laser, but thought the cheshire was a bit more accurate in terms of secondary placement.
But if it was collimation, then the image wouldn't shift between exposures if the mount is continually guiding with phd? that's what got me to think of the image scales and guidecam/imaging ota colinearity.
I do have collimation to take care of though. also the ccd tilt if any.
I might also try increasing the mpcc spacing. I never really measured the qhy8/mpcc spacing as I assumed the adaptor would take care of that as it was custom built. But looking at the results in the ATM section with the custom spacer, he got best results at 59mm.
if only these clouds would clear.
here is the phd graph during those subs, I changed the scale to 50 frames for more granularity.
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