The picture below is a composite of 50 separate 30 second images taken at ISO400 using a Canon EOS 400D with a 200mm lens at f/2.8. The moon was so bright that I couldn’t do 30 seconds at ISO800 – the images was just completely washed out. It’s only a shame that I didn’t remember to take the frames in RAW mode – so I ended up with a load of jpgs 🙁
Flats and darks were applied, and subsequent processing performed using Images Plus. Images were stacked on the comet, producing the trails of the stars as the comet moved past.