A photographic slide mounter cuts photographic film transparencies from a photographic film web and inserts the transparencies into slide frames. The slide mounter includes a slide advance device which advances a slide frame to a position where the slide frame is flexed to provide an insertion opening. The film web is advanced into the insertion opening until a leading end of the film is partially inserted into the slide frame. A knife severs a transparency at a position outside of the slide frame. The slide frame with the partially inserted transparency is then advanced along a track away from the film severing and insertion station. The film transparency is engaged and fully inserted into the slide frame as the slide frame and the transparency are fed along the track. A film curl accommodator bends the slide frame by an amount sufficient to match the curl or bow of the transparency as the transparency is being fully inserted into the slide frame.