Summary: The Canon EOS autofocus camera has three autofocus modes. Learn how to activate the autofocus mode of the Canon EOS 40D Digital SLR camera in this free Canon photography lesson.
Ryan Vaughn is a photo enthusiast who has used his expertise for professional wedding portraits and business promotion. He has used Canon's 20D and 30D models as well as the latest...read more
"Alright. We're talking about the 40D and its auto focus modes. To set those modes, what you need to do is look on the top of your camera where there are four buttons. The second most button to your right looking down on the camera is your auto focus slash drive mode button. And to set the auto focus mode, go ahead and push that down and then, with your other finger, use the main control dial to scroll through those and you'll see here on the right side of the LCD screen those modes are being toggled through. So you have, you have three different modes, one shot mode, AL focus mode and AL servo mode. Once you've selected that, all of the other settings present in your LCD will come back into view. And that is your auto focus mode."
eHow Article: Canon EOS 40D: Selecting Autofocus Mode