Pentax's AF fast fifty — the F 50mm f/1.7 with autofocus in K-mount.
The Pentax SMC F 50mm f/1.7 is one of Pentax's earliest autofocus fast fifties for K mount. The F designation indicates the AF-era series. At f/1.7, it provides the standard fast-fifty experience with autofocus. The SMC coating ensures good contrast. One of the first AF primes in the Pentax K-mount system.
Good SMC optical quality. The f/1.7 provides useful speed. Autofocus via body screw-drive motor. Pleasant Pentax rendering. Build quality adequate for the era. The F-series AF was Pentax's first autofocus generation. Benefits from body SR on digital Pentax — a significant advantage at 50mm for handheld use.
Pentax K mount with AF. Filter thread 49mm. Weight approximately 170 grams — compact. Build quality adequate. Screw-drive AF using body motor. The F-series predates the FA series which adds program-mode compatibility. Benefits from body SR. 49mm filter — compact. Compatible with all Pentax K-mount bodies.
Available at very low prices. Check AF and clean optics. A budget AF fast fifty for Pentax K. The FA version adds program mode compatibility. Benefits from body SR. Good for budget K-mount fast-fifty with AF convenience. The Pentax DA 50mm f/1.8 is the modern DX alternative.