Nikon Multi-Control Back MF-23 is designed exclusively for Nikon F4 Series cameras. The MF-23 permits the imprinting of any data specific to the film and image (i.e date, time frame number, shutter speed, aperture, exposure, etc.). In addition, MF-23 offers choice of imprint location. Additional features include: Interval-Timer, freeze focus to automatically release shutter a preset focus position, auto exposure bracketing, exposure delay, long time exposure, and stop functions.