Pentax INTERCHANGEABLE LENS - Manual (Page 6)

• When using FA lens with the K-mount
Pentax camera having no lens information
contacts, be sure to set the lens aperture
ring to any f-stop other then A. If set to the
"A" position, the lens will automatically be
set to the minimum aperture, causing
improper exposure.
CAUTION :
• Be careful not to damage or dirty the lens
information contacts and AF coupler on the
mount surfaces of the camera and lens.
Otherwise, failure or malfunction may
result. If this occurs, wipe them gently with
a clean, dry cloth.
• FA J18-35mm f/4-5.6AL, FA J28-80mm
f/3.5-5.6AL and FA J75-300 mm f/4.5-
5.8AL lenses have no aperture ring to set a
f-stop manually. Aperture settings are con-
trolled automatically as if set to the auto "A"
position, so accessories without an auto
"A" setting cannot be used with these lens-
es.
Camera/Lens Mount Compatibility
Pentax camera/lens mount compatibility chart
is shown below.
4
K
AF2
-mount
which is equipped with
° Power contacts
° AF coupler
° Lens information contacts
K
AF
-mount
which is equipped with
° AF coupler
° Lens information contacts
K
A
-mount
which is equipped with
° Lens information contacts
K-mount
(base mount) -
-will not autofocus, autozoom.