Give up…
Will try again in 10 days when higher in the sky and I can take longer subs. Stack below from DSS trying to focus on the comet and the stars. FoV 5.93 degrees x 3.95 degrees; focal reducer flattener is designed for cropped sensors, not full frame sensors which is why I think there are still some obvious gradient rings from some vignetting despite making some flats.
Video of the comet moving over one hour also available here, but 200MB:
https://www.dropbox.com/s/gvtr6kk4mmoouio/IMG_7940_pipp.avi?dl=0
James
