When I receive my processed slides, the frame #0 (and sometimes #00) are returned unmounted and apparently undamaged. I wish that I could take advantage of the unused frames to shoot an identifier such as a gray card and/or a color card along with my name and address in case of loss or misplacement. I see no custom function to enable winding to frame #0 in any of the manuals. It just seems to be a waste of film. Has anyone experience with this?