The Pentax SMC FA 50mm f/1.4 is a fast-aperture prime lens for Pentax K-mount cameras.
Key features include:
75mm-equivalent focal length on an APS-C DSLR
Great for portraiture and low-light event photography
Quick autofocus
Compact build
Fast-Aperture Short Tele. When mounted to an APS-C DSLR, the Pentax SMC FA 50mm f/1.4 provides a 75mm-equivalent focal length, an excellent choice for portraiture, low-light event photography, and any other shooting conditions under which you need a fast-aperture short tele.
Fast Autofocus, Compact Build. This lens offers relatively snappy autofocus in a compact size that makes it easy to keep in your bag at all times