Nikonites
Nikon F2AS Review (5)

28/06/11
The F2 could also mount the Nikon MF-1 (33/10 feet/meters film = 250 frames; required two Nikon MZ-1 film cassettes) and MF-2 (100/30 feet/meters film = 750 frames; required two MZ-2 film cassettes) bulk film backs. These were very useful if a photographer had a motor drive mounted and needed to take more than seven seconds worth of photographs. Note that the MF-2 and its MZ-2 cassettes are very rare.