Pentax K-mount
The Pentax K-mount , sometimes referred to as the "PK-mount" , is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex ( SLR ) cameras . 
<triplet> Pentax K-mount <subj> lens mount <obj> subclass of <triplet> lens mount <subj> bayonet <obj> subclass of <triplet> photographic lens <subj> lens mount <obj> connects with <triplet> camera <subj> photographic lens <obj> has part