Pentax SMCP-M 50mm f2
smc PENTAX-M 1:2 50mmColor	blackYears of Production	1979 ~ 1985Catalog Number	20677Optical Formula	5 elements in 5 groupsAperture Range	f/2 ~ f/22Number of Aperture Blades	6Minimum Focusing Distance	0.45 mMaximum Magnification	0.15 XFilter Diameter	49 mmMaximum Diameter	63 mmLength	31 mmWeight	160 gCap	plastic clip-on cap, 49 mmscrew-on hood: PH-R49