It's been awhile since there have been any bright comets in my night sky. Last night I was able to bag my 35th comet with the 10 inch Dob: C/2017 T2 PANSTARRS.
It wasn't particularly impressive but it did fall in the same field of view as the Perseus Double Cluster (with the 40mm eyepiece). At higher magnification (15mm eyepiece) the comet showed better contrast against the sky and looked, to my eye, like a slightly diffuse comma.
At the same time I was imaging the region with the 80mm refractor. The comet didn't move much during the 40 minutes I was getting pictures. The image below is a combination of stacking on the stars and on the comet separately and blending the images in Photoshop.