Pentax K-mount (adapter variant with aperture ring for DA lenses available)

This convention is also used in Pentax K-mount and Sony Alpha lenses but is opposite of the direction normally used by Canon.

Bojidar Dimitrov's Pentax K-Mount Equipment Page: LX (early version), LX (late version)

Asahi, maker of the Pentax, was engaged first; and it went as far as Zeiss designing a common lens mount, which became the Pentax K-mount after the two firms parted company.

The Pentax MG could use any pentax K-mount and can still be used with current Pentax lenses There was a self-timer and a hot shoe with an additional contact for dedicated Pentax flash units.

The Nikon F-mount is one of only two SLR lens mounts (the other being the Pentax K-mount) which were not abandoned by their associated manufacturer upon the introduction of autofocus, but rather extended to meet new requirements related to metering, autofocus, and aperture control.