Not much processing here. It's not stacked and was recorded as a single JPEG file instead of RAW image file. Some vignette removal was required due to light-falloff at the edges. It's still a bit bright in the center of frame but that's typical of this lens design.

A 6-second exposure of Comet C/2019 U6 (Lemmon) with an EF 135mm f/2 lens on the Canon EOS Ra. The green hue of the comet was visible even on the LCD on the camera's Live View. Was quite easy to spot in every picture I took although I was unable to make it out with my eyes. I believe the comet was at a magnitude of 6.0 when I took photograph... which is right on the verge of not being able to see it. The clouds arrived quickly in various layers of the atmosphere and ruined any chance for me to capture anything better at the time.