Other Features
The FM has a "full information" viewfinder. In addition to the metering LEDs; the viewfinder also displays the set shutter speed and lens aperture to give context to the LEDs. A fixed K-type focus screen with 3 mm split-image rangefinder and 1 mm microprism collar is fitted.
Major system accessories for the FM included the MD-11 and MD-12 motor drives; which enabled continuous film advance at 3.5 frames per second, the Data Back MF-12; enabling the imprinting of date and time data on the film, and the Speedlight SB-8E electronic flash; guide number 82/25 (feet/meters) at ASA 100.
Note that there were two distinct versions of the FM, depending on how the FM's light meter (see below) was activated when a motor drive was mounted. The original FM had a rotary switch shutter button collar to switch to motor drive mode when the MD-11 was mounted. The MD-12 activated the meter automatically and the switch was omitted on late (1979 or after) FMs. Nippon Kogaku also took the opportunity to construct late FMs more strongly internally than early FMs.
Read more about this topic: Nikon FM
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