I recently bought a Canon EF 24-70/2.8L to use with my 450D and I suspect that it is constantly back focusing. Is there any way of determining if it is something wrong with the lens or if it is a problem with my technique/camera?

I suppopse I could send the lens to Canon for calibration, but before I do that I want to make sure it will actually help.


To check if your camera/lens is having front-focus or back-focus issues you can download a pdf (incl a focus chart) here:


The interesting stuff starts at page 13.

  • 1
    This link leads to spam pages now, so it should probably be revised.
    – Szabolcs
    Aug 27 '13 at 3:50

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