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Canon 450D autofocus problems

Started Apr 29, 2016 | Questions thread
WilbaW
WilbaW Forum Pro • Posts: 11,643
Re: Canon 450D autofocus problems

Marc dbr wrote:

When I shoot portraits where my subject isn't moving I have my focus mode set to "one shot", when I shoot kids portraits and action I have it set to "AI Focus" and when I shoot something like a soccer game I have it on "AI servo".

You only need One-shot for a few specific purposes (mainly to be able focus then recompose). In all other cases where you can keep an AF point where you want it on the subject, Servo is better. (I know that's not what it says in your camera manual, but the recommendations there are variously vague, simplistic, ambiguous, and misleading. You can do better.) "Nobody" recommends AI Focus.

I think that my 450D needs calibration though because even when I'm in "one shot" single point AF, with still subjects, the eyes of the subject can be slightly out of focus. I have to say that when my subject is not moving, I have the best chance to get a sharp image

I wouldn't jump to that conclusion. There are other things that can cause blur that's easy to mistake for a focus problem. Tell us more about your settings (filter? shutter?...), technique (how you're holding and/or supporting the camera, how you frame the shot, how you press the shutter button...), and post an image with full EXIF that shows the problem, and we might be able to spot something.

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