Some camera bodies, including all Canon EOS bodies and the more budget-oriented among Pentax'DA * designated models, although normally using an inbuilt motor, can fall back to screwdrive operation when the camera body does not support the necessary contact pins.
12.
The Pentax K-F mount added five electrical contact pins protruding through the lens mount flange at the 5 o'clock position ( when viewing the ME F body from the front ) to the original Pentax K mount ( introduced 1975 ) to pass focus control information between the camera and the lens.
