There are various ways to post process a set of comet images, one way stacks the comet and leaves the stars to trail. The other way is to stack the stars and the comet, which leaves you with a nice comet and a fairly clean star field in the background.
This was taken on 4-1-17 in Cathedral City, CA
Celestron AVX Mount
ASI120MC-s Guide Camera
Astromania 60mm Guidescope
Comet with trailing stars
Comet and corrected star field
Inverted timelapse video, about 2 hours