sentences:  Although the ME F was an interchangeable lens camera (the photographer could remove and exchange its lens for another), its AF function required the unique SMC Pentax AF 35 mm–70 mm f/2.8 Zoom Lens autofocus lens using a special Pentax K-F lens mount.Unlike all later Pentax AF SLRs, the ME F did not have the focusing drive motor and keying shaft built into the camera body.The drive motor was in the lens instead.