The Pentax-M 50 mm lens, having 6 elements in 5 groups, lets you change set the focus as per the requirement. With a maximum aperture of f/1.7, this Pentax lens provides great contrast and sharp colours. 49 mm filter of this SMC lens ensures perfect light transmission to produce bright pictures. Minimum focusing distance of 45 cm in this Pentax lens gives clear pictures even if you click very closely. Having a 6 blade diaphragm, stopping down to f/22, out-of-focus objects come clear with this SMC lens. The Pentax M lens, with a Maximum Reproduction Ratio of 1:12.5, captures minute details of small objects clearly.