Nikon MF-21 Multi-Control Back (F-801/N8008,F-801S/N8008S)

Imprint function: Year/Month/Day, Month/Day/Year, Day/Hour/Minute. Frame count, Sequence number, Desired fixed number, Camera shutter speed and aperture. Auto Exposure Bracketing: Lets you shoot up to 19 continuous frames, each with a different exposure. Interval timer function: Let you take a specified number of shots at specified intervals for a specified number of shootings. Freeze focus (Focus Priority) function: The camera's shutter is released - automatically - when the subject enters a preset focus position. Long time exposure function: By setting the exposure duration in hours/minutes/seconds, you can set Long Time Exposures of up to 99 hours, 59 minutes and 59 seconds ( depending on life of main camera battery). Uses Battery (1-CR2025).