I was experimenting with high ISO settings and short exposures for this impromptu imaging session of Comet ISON. I went with 1 minute at ISO 3200, which is equivalent to 4 minutes at ISO 800, the ISO setting I was using for most of my other ISON images. That is double what I was using before. Yes, its noisier, but tolerable in the cool 47 degree temps I had that morning.
Also, this is the full field of my imaging rig. The only cropping done was to remove places where the sub-images did not overlap. I wanted to demonstrate how large the comet is getting.