Test a Pentax digital camera autofocus system.
Troubleshooting digital cameras such as a Pentax requires a methodical approach. Testing each camera function separately should allow you to identify the problem. Digital cameras also have a significant amount of electronics and circuitry that may require more specialized servicing.
Instructions
1. Remove the battery from the camera. Clean the battery contacts in the camera and on the battery using a pencil eraser. Replace the battery with fully charged battery.
2. Turn the camera on and select "Aperture Priority" exposure mode. On most Pentax digital SLRs, turn the exposure mode dial on the top of the camera to "Av," or aperture value. Adjust the lens aperture by rotating the wheel on the front of the camera in the grip. Test fire the camera by pressing the shutter release button at each new setting. Look through the front of the lens as the camera fires to see if the lens blades close. It helps if you put the camera in manual focus mode. When the aperture is set at the widest opening, you will not see any of the lens blades move.
3. Turn the exposure mode dial to "Tv," or shutter priority, and run through the same test. This time remove the lens from the front of the camera by pressing the lens lock button on the front of the camera and rotate the lens until it disconnects from the camera. View shutter blades each time you press the shutter release.
4. Reattach the lens, place the camera back into autofocus mode and test the autofocus system by selecting a point close to you and far away, move the camera focus point to each item and see how fast the camera is focusing. Set the camera to "AF-C," or auto focus continuous, select a point, focus the camera and with the camera held to your eye, walk closer to the subject and then further away. The lens should continue to focus on the subject.
5. Remove the lens and use the cotton swab with a small amount of rubbing alcohol on it to clean the metal contacts on the lens and the camera mount. Use a microfiber lens cloth to remove any residual moisture. Re-attach the lens, turn the camera on and test shoot the camera.
Tags: exposure mode, front camera, autofocus system, camera pressing, exposure mode dial, from camera