11

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.

6

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

http://focustestchart.com/focus21.pdf

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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.