Lens mounts

Pentax K lens mount

Inner mount diameter 44.5 mm
Outer mount diameter (wings) 48.0 mm
Diaphragm actuator by a wing
Register 45.5 mm

More on Pentax K mount

Konica AR lens mount

Inner mount diameter 43.5 mm
Outer mount diameter (wings) 46.0 mm
Diaphragm actuator by a gap between wings
Register 40.5 mm