Introduced in 1979, Fujica AX-1, AX-3 and AX-5 were the first 35mm SLR cameras developed for this system. They featured a new Fujica X bayonet mount, TTL exposure metering and electronically controlled shutter with speeds up to 1/1000 sec. The AX-1 only had aperture-priority auto exposure metering mode, while the AX-3 also offered manual exposure mode, and the AX-5 added programmed auto and shutter priority auto exposure modes.
Fujica STX-1 (1979) and STX-1N (1983) were fully mechanical cameras based on the Fujica ST605N from the older M42 system. Compared to the AX series, the shutter was mechanical, and the top speed was reduced down to 1/700 sec. The faster shutter speed of 1/1000 sec. became available with the Fuji STX-2 (1985).
Fuji AX Multi Program (1985) featured a more intelligent programmed auto mode with Normal, High speed priority and Depth-of-field priority modes.
A wide range of X-Fujinon and X-Fujinar lenses were available in the system, from a 16mm fisheye to a 400mm super telephoto lens. DM-labeled lenses supported all auto exposure modes available with the AX-5. The rest of the system's lenses could be used for full aperture metering and aperture-preferred auto exposure mode.