The Pentax-DA 50mm f/1.8 medium-telephoto autofocus lens provides a focal length of 76.5mm in the 35mm format. This affordable portrait lens is designed for use with the company’s K-mount bodies. The Pentax-DA 50mm f/1.8 medium-telephoto autofocus lens will be launched in July 2012 for just $ 249.95 a pop. [PhotographyBay]