Testing your camera for autofocus (AF) problems

Testing your camera in the "real-world" is not going to be a very good test of the actual AF system because so many uncontrollable variables are involved. The fact may very well be that the AF system is just not capable of operating as you want it to, however that does not mean it's faulty. Every camera has its limits and you need to learn how to work within those boundaries. On the other hand if you think your camera has an autofocus problem, it is best to test this assumption using the correct method. Testing can be performed on all your lenses using a tripod and an focus chart. Visit http://md.co.za/d70/chart.html and download the test charts and print them out. Although the link is for the Nikon D70, these charts should apply for any digital camera manufacturer such as Canon, Pentax etc. If your camera fails the autofocus test, it is very likely to be a camera problem and your camera will need servicing.

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