>>(it doesn't take exactly the same length exposure, which >is >>the more traditional approach). >> >I've found that the NR exposure on Nikon bodies is usually the >same as the actual exposure - e.g. if the actual is 30 secs, >the NR is also 30 secs.
I did quite a bit of testing on my D300, and the longer ones are substantially shorter, don't have it with me now to test but like 30% shorter or more.
Maybe this varies by camera. It was actually a bit disappointing that they didn't do the full exposure, while I guess they could extrapolate, it would seem better to be identical. maybe some models are?