Pentax's M-series 50mm f/2 — the slower compact standard prime alongside the f/1.7.
The Pentax SMC Pentax-M 50mm f/2 is a compact manual-focus standard prime from Pentax's M-series lens generation. SMC = Super Multi Coating; M-series = compact lightweight lens generation for MX/ME bodies; f/2 = standard aperture class. Pentax K mount.
f/2 maximum aperture. 50mm focal length (full-frame). SMC Super Multi Coating. M-series compact design. Manual focus. At approximately 115g. 49mm filter thread. Pentax K mount.
The M-series designation indicates Pentax's compact lightweight lens generation — the 50mm f/2 M weighs only 115g, making it one of the lightest fast normal primes for any SLR system. SMC coating reduces flare. Compatible with all Pentax K-mount cameras including modern DSLRs (manual focus mode).
On the used market the Pentax SMC Pentax-M 50mm f/2 is an affordable compact manual-focus standard prime. Condition checks: 49mm front element for marks, aperture blade condition (oil-on-blades common), focus ring damping. Pentax K mount — manual focus on all K-mount cameras.