Focal length 50mm Crop factor 1.0 | Focal length (35mm equiv.) 75mm Aperture (max/min) f/1.8 / f/22 | |
The SMC Pentax-DA 50mm f/1.8 lens is a normal prime lens for the Pentax K-mount. The 75mm equivalent focal length on APS-C cameras and fast f/1.8 aperture make it well suited for portrait photography. It uses a simple double-Gauss design of 6 elements in 5 groups.
Similar lenses from other manufacturers include the Canon EF 50mm f/1.8 II and Nikon AF Nikkor 50 mm f/1.8D.
References
Pentax DA 50mm lens Wikipedia(Text) CC BY-SA