Attached is a single image from Sat nights run of the Keyhole via the C9.25 suing the 0.63 reducer.
Stars in every corner appear to be elongated as if the frame has turned slightly. Any ideas what causes this? Will field rotation show up like this from guiding on a star that is not in the field of view.
There is some "slop" in the canon t-ring adaptor that I though might contribute, but I tape this up to keep it steady.
Anything else
