Technical Details: 10 minutes at f/11, ISO 160. Canon 5D Mark II with an adapted Olympus Zuiko 21mm f/3.5 lens.
In-camera noise reduction was turned on for this image as the temperature outside was still somewhat warm (mid 60's). In-camera noise reduction is useful on exposures of this length, especially in warmer conditions. If you need to walk a few minutes between camera setups, that's a perfect time to let noise reduction run. The 5D Mark II has a remarkable battery life. Even with 6 hours of night photography with in-camera noise reduction turned on for many of the shots, I almost never have to replace the battery. On the original 5D I would often go through 2-3 batteries in a night of shooting with noise reduction turned off.