sentences:  This includes lenses with the Pentax K-A mount (introduced 1983) and the K-AF/AF2 mounts.However, the newest SMC-Pentax FA J (1997) and SMC-Pentax DA (2004) types, lacking an aperture control ring, have severely restricted functionality.There were over thirty contemporary manual focus Asahi Optical made lenses of the SMC Pentax-M and SMC Pentax-A types.