Here’s a reprocessed version of my comet ISON photo from Nov 15th, right around the time of the outburst. This image uses the Luminance channel. It was a bit of work to stack it all together, and it changes the color, increases the resolution but also dims some of the finer features. I think I like the original one better, but since the clouds on both coasts have kept me from imaging I figured I’d work with the data I already collected.
This photo is the result of 3×60 seconds exposures, one each through red, green and blue filters and 3×60 seconds of luminance or clear filter shots.