Pentax FA 28-200mm f/3.8-5.6 AL[IF] — autofocus superzoom for KAF-mount film SLRs
The smc Pentax-FA 28-200mm f/3.8-5.6 AL[IF] is an autofocus superzoom Pentax produced for its KAF-mount film SLRs of the mid-1990s, such as the PZ-1 and MZ series. It was pitched as a one-lens travel solution, covering wide-angle to short telephoto in a single compact autofocus barrel.
The optical formula uses 16 elements in 14 groups, including an aspherical (AL) element, with internal focusing (IF) driven by the camera's in-body screwdrive motor. It has a 72mm filter thread, weighs 465g, and focuses down to 52cm for 0.23x maximum magnification. The 6-blade diaphragm runs f/3.8-5.6 to f/22-32, and it was sold in black and silver/black finishes.
As a 7.1x consumer superzoom the design trades some outright sharpness and contrast, especially at the long end wide open, for range and portability compared with Pentax's shorter A-series and FA primes. Screwdrive autofocus is noticeably slower and noisier than later SDM-driven Pentax lenses.
It remains an affordable option on the UK used market for owners of Pentax film bodies or DSLRs needing a screwdrive-compatible autofocus motor. Buyers should test the AF coupling engages cleanly (screwdrive lenses need a body with a focus screw), check zoom creep, and confirm the aspherical element is free of coating separation.