> I think I know what's going on. are you shooting the scene >without having the viewfinder coveredwhen in viewfinder mode? > it is not uncommon to have light enter through the back of >the viewfinder and change the exposure.
Thanks David for your response. But yes. when I am in live view, I do have the viewfinder covered. I didn't use the cover, but rather a piece of gaffer tape i always have with me which does the job as well. Oddly enough, this does not happen with my D700. With the D700, the exposure stays the same.