see also:

• Pentax K mount camera system
• Pentax M42 lenses

• Pentax K mount bayonet was introduced in 1975 to replace the old M42 screw mount
• in 1977, in response to the compact Olympus OM system lenses of 1973, Pentax started creating more compact lenses (“Pentax M”) for their new compact 35mm SLRs, the Pentax ME and MX
• in 1984, in response to Canon's shutter priority exposure mode, the “Pentax A” lens family also offered shutter priority mode
• in 1992, in response to Canon's AF technology, the Pentax FA range of auto-focus lenses were made

• 1975:
  • SMC Pentax K 85mm f/1.8 (1975-77) - optically, same as its M42 mount predecessor

• 1977:
  • SMC Pentax M 85mm f/2.0 (1977-84) - not as sharp as the older lenses
• 1984:
  • SMC Pentax A 85mm f/1.4 (1984-89) - similar to Zeiss Planar 85mm f/1.4
• 1992:
  • SMC Pentax FA 85mm f/1.4 (1992 -