Pentax K Mount

The Pentax K mount, sometimes referred to as the "PK mount", is a lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has been used by all Pentax 35 mm and digital SLRs since; it is also used by the Pentax K-01, a mirrorless interchangeable-lens camera introduced in 2012. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras.