Everyone knows and loves the various cameras: FM, FE, FM2, FM2n, and FE2. But there are a series of cameras that are part of the minor F's that make some significant technological splashes and some belly flops that are generally not as well known or are out of reach of the average photographers. These cameras were used to experiment with new technologies before they hit the big times with professional cameras. First is the Nikon FG, produced from 1982 to 1984; it was the first camera from Nikon to have full auto-exposure and semi-automatic and metered-manual modes. The Nikon FA, released in 1983, had a new matrix-metering system that used an internal CPU to determine the exposure based on multi-pattern detection. Produced from 2001 to 2006, the FM3a is the perfect hybrid of the FE2 and FM2n; it is a fully electro-mechanical camera with semi-automatic aperture priority metering and functions as a manual camera when no battery is present. And then there is the FM10, a camera in Nikon name and mount only, aimed as back-to-basic student cameras that were contract builds from Cosina and based on the Cosina CT1 Super but with several customizations not available on the stock model. These included the Nikon F-Mount, depth-of-field preview, meter activation button, and multi-exposure override. Released in 1995, they remained on the market until 2015.