Comet 21p with M35. Image was processed to accentuate the green color.
Comet 21p with M35
My exposures spanned about 24 minutes. So, I put them together into an animated GIF to show the comets apparent motion over 24 minutes:
All photos were taken with a 3-inch refractor at F5. Exposure times and ISO settings varied, but my best results were with 1600 ISO at 30 seconds and 800 ISO at 60 seconds. Any longer, and I get too much light pollution. Still, I'm happy with what I can capture under my semi-urban sky.