The Pentax LF-80 Frame Matte Focusing Screen is the standard screen supplied with the K20D camera. Currently, Pentax offers 2 optional screens as well: the LI-80, with a crosshair-type scale, and the LL-80, which combines the focusing area brackets with a grid.
The LF-80 is offered here as a replacement for a lost or damaged screen.
Standard AF screen as supplied with K20D camera
Includes AF area marks and partial metering zone circle