Pentax's motorised 35mm AF compact — 35mm f/2.8 prime, infrared AF, DX coding, built-in winder, AA power.
The Pentax PC35AF-M was a 35mm autofocus compact introduced in 1984 as the motorised development of the PC35AF of 1982, the first autofocus compact Pentax made. The M stood for motor: where the original needed a thumb wheel or an add-on winder, this model built the power film advance into the body. A Date version and a 1985 SE special edition followed in the same family.
It kept the well-regarded Pentax 35mm f/2.8 lens of five elements in five groups, focused by an active infrared triangulation autofocus system with focus lock, working from 0.7m to infinity. Film speed was set automatically from DX codes across ISO 25-1600, with manual settings of 100, 200, 400 and 1000 for non-coded cassettes. A built-in flash and the integral winder completed the package, powered by two AA batteries.
The sliding-cover design and sharp five-element prime made it a capable walk-around camera, and it remains a sensible pick for street and travel shooters who want autofocus and a proper glass prime without zoom compromises. It is larger than later 1990s compacts but simple to operate, and AA power is a practical advantage over lithium-cell rivals.
These are battery-dependent cameras: nothing fires without two healthy AAs, so test the winder motor and flash charge before buying. Check that the lens cover switch still wakes the camera, listen for a smooth (not laboured) motor advance, and inspect the film door seals. Distinct from the thumb-wound PC35AF, which is catalogued separately.