The Fujifilm GA645 Professional, introduced in 1995, is an autofocus 6x4.5 medium format rangefinder-style camera - often described as a medium format point-and-shoot. It takes 120 or 220 roll film, giving sixteen 645 frames per roll of 120, and was joined at launch by the wide-angle GA645W before being updated as the GA645i in 1997.
It pairs a Super-EBC Fujinon 60mm f/4 lens (about a 37mm equivalent) with hybrid active/passive autofocus, program and aperture-priority auto exposure plus manual, motorised film advance, a built-in pop-up flash and an LCD readout, all running off a 2CR5 lithium battery. Unusually, the native framing is portrait orientation, and the camera can imprint exposure data between frames.
Nothing before or since has offered quite this combination: genuine 645 negatives from a camera you can operate one-handed like a compact. That has made the GA645 a favourite with travel and street photographers moving up from 35mm compacts, and demand comfortably outstrips supply on the UK used market.
The crucial caveat when buying is that these are electronic cameras Fujifilm no longer supports - if the electronics fail, the camera is effectively scrap, so pay for condition and function, not cosmetics. Fire it with a test roll if possible: confirm autofocus locks and the distance readout changes, the LCD is complete with no bleed, the flash pops up and charges, and the motor advance is smooth; listen for grinding on power-up, and ask whether it has ever shown lens-error messages, a known way for these to bow out.