Pentax -D - Manual (Page 9)

7
AF coupler
Lens information
contacts
About the Lens Mount
The D FA lens mount is called the “K
AF
- mount.” This lens mount enables autofocus and
autoexposure.
K
AF
-mount
CAUTION
Be careful not to damage or dirty the lens information contacts and AF coupler
on the mount surface of the lens. Otherwise, failure or malfunction may result.