But why use multiple exposures in the first place? I don't want to be Man Ray with his photo collages.
I thought it was a remedy for high noise when shooting in dark places. Camera on a tripod. Two or three underexposed (intentionally) images, each having little noise. But adding up to correctly exposed, and noiseless single image. I guess this would suggest high ISO, or long shutter speeds.
I'm asking, because I don't know a thing about his and just came across a posting discussing some of the little-known treasures in the D7000 Shooting Menu.