Question about Canon EOS 40D Digital Camera

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Canon 40D focussing problem

I have many pictures out of focus - working with the central focus point only. I found out that the central focus point is much bigger than the red light marker and focuses closer objects, outside, but relative near of the red rectangle. Did anyone experienced something similar, or my camera have a problem? (sorry for the very basic english)

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  • pruittkim Oct 11, 2008

    I have the same problem. I have contacted Canon and I am getting ready to box up my 40D and send it in for repairs! At this point, my XT is doing a much better job!

  • Anonymous Oct 22, 2008

    I have the same problem with my new EOS 40D. Regardless what focusing point I choose the object is always out of focus. The results are much worse than with point and shoot cameras.

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2 Answers

Thank you for your detailed answers. I know the antialias is very strong on this camera type, but the sharpening of a soft image is worse than a good start image. Not the aa is my problem: I'm focussing on an eye (a not moving person), but the focus is on the peak of the nose. I'm focussing a bird which covers entierely the central focus point marker, but the focus is on some near tree branches. I do not understand why the focus marker have different size / shape than the focus sensor itself or why the sensor fix the focus on small closer details in its border zone, as I have enough contrasty objects covering almost all the focus sensor surface (must read the marker surface). Is there my camera defective, is it a wrong design / firmware or is a "feature"? It is not a front focussing issue, because shooting a plane map or object, the focus is ok. On the other hand, I have the same problem on my all three lens: 70-200 f4/is, 24-105 and sigma 105. With my old 400D I had not so fast, but much more accurate focus, same my daughter with 350D.

Posted on Nov 05, 2008

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  • 6 Answers

Yes, I do have the same experience but it happens to be solved using the AI focus mode instead the single shot one. We also have to know that the AA of this camera is stronger than the previous generations of XXD cameras.
For the ones saying about not being as sharp as the point an shot, take into account that you can set the sharpening to be as strong as you want with a limit of 7 degrees of sharpening in camera. (but it only works with jpegs)

Posted on Nov 05, 2008

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Posted on Jan 02, 2017

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