The FM is constructed almost entirely from metal and uses a mechanical shutter. It is manual-focus-only, with manual exposure control. Being mechanical, the FM needs no batteries to operate (though two 1.5 volt 357 or 76A or LR44 or SR44 cells are required to operate the light meter). The metering system comprises a gallium-arsenide-phosphide photodiode (with 60/40% center-weighting) that meters through-the-lens at maximum aperture. Its reading is displayed by a "center-the-LED" system using vertically arranged LEDs next to +/O/- markers on the right side of the viewfinder that indicate overexposure, correct, or underexposure, respectively. The photographer adjusts the aperture or shutter-speed until the "O" LED illuminated to indicate correct exposure. This system can be traced back to the NikkormatFT of 1965 and its "center-the-needle" system.
The camera with Nikkor 50 f/1.8.
Cosmetic: Overall okay condition with signs of use.
Optical: Viewfinder has a little dust. Lens clean with little dust and no haze/fungus/scratches.
Mechanical: All shutter speeds are accurate and all mechanical functions are working.