#1. "RE: Long Exposure Noise Reduction Question" In response to In response to 0
Yes, you can put the lens cap back on and take the camera back to the car while the NR is processing. Just don’t turn off the camera. Also make sure that you start off with a full battery – the battery will drain faster in the cold than normal.
If the car is warm when you go back, you may want to put the camera in a plastic bag before getting in the car to avoid condensation.
Good luck and let us know how your shoot goes!
Dave Summers Lowden, Iowa Nikonians Photo Contest Director
Nikonians membership - "My most important photographic investment, after the camera"