4 4 2. 8 8 5. 6 A 22 16 11 Aperture ring Depth-of-field scale Aperture-A-lock button The Pentax FA lenses are primarily designed to work with the Pentax autofocus SLR (KAFor KAF2-mount camera), making autofocus shooting possible. When Pentax FA Zoom lenses with power zoom function are used on the Pentax KAF2mount camera, the camera features a Power Zoom system. · An FA zoom lens without the power zoom contacts are shown in the illustration does not have the power zoom function. · Do not damage or dirty the power contacts. KAF2-mount KAF-mount AF coupler Lens-information contacts Power zoom contacts 3 · 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. · UCF M 10X2118-35mm f/4-5. 6AL, UCF M 10X2128-80mm f/3. 6AL and UCF M 10X2175-300 mm f/4. 8AL lenses have no aperture ring to set a f-stop manually. Aperture settings are controlled automatically as if set to the auto "A" position, so accessories without an auto "A" setting cannot be used with these lenses. 4 Camera/Lens Mount Compatibility Pentax camera/lens mount compatibility chart is shown below. KAF2-mount which is equipped with ° Power contacts ° AF coupler ° Lens information contacts KAF-mount which is equipped with ° AF coupler ° Lens information contacts KA-mount which is equipped with ° Lens information contacts K-mount (base mount) -will not autofocus, autozoom. MOUNTING AND REMOVING OF LENS 1...