Originally posted by Lowell Goudge its not bracketing by any chance is it?
does exposure change , either shutter or aperture between shots?
No, I get 2 identical shots - except for slight camera position change. Same exposure & other settings. I have never used continuous-shooting on the istD, but that was the first thing I checked. I bought the camera from another forum member in Sept last year, and the problem surfaced in Nov. or Dec. It was becoming a real annoyance, as I reported in the original post here. (btw, it was happening with all lenses, not just MF ones.) It's tolerable now, using the 'shutter-button massage' technique - probably around 5% or less of my shots are doubled.