Pentax's classic M-series standard prime — compact 50mm f/1.7 for the miniaturised M system.
The Pentax SMC Pentax-M 50mm f/1.7 is the standard normal prime from Pentax's compact M-series — the generation that dramatically miniaturised SLR cameras and lenses in the late 1970s. SMC coating for quality.
Optically good — sharp from f/4 with pleasant rendering at f/1.7. SMC (Super Multi Coating) provides good contrast and flare resistance. The f/1.7 provides useful low-light capability. Manual focus with smooth compact helicoid.
Pentax K mount with 49mm filter thread. Very compact — the M-series minimised size. Manual focus and aperture. Metal construction. Compatible with modern Pentax DSLRs in manual mode. Adapts to mirrorless cameras.
Available used very cheaply — millions made. The K-mount adapts to all mirrorless cameras. A pleasant manual-focus standard prime. Check for smooth focus ring and clean optics. For film photography and adapted mirrorless manual-focus use.