Both front and back focus on 5Dmk2

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gsturm20
gsturm20 New Member • Posts: 3
Both front and back focus on 5Dmk2

Hi everyone!
I'm experimenting some issue about front and back focus that really give me headache...
I resently bought the Sigma 50mm 1.4 EX ( not the art, which I can not affort with my budget). I know this lens is subject to AF issue, but I know too that my 5Dmk2 is able to fine tune the AF correction, so I went for it and bought this lens.
But with this lens I have some front AND back focus, front focus in short distance and back focusing in long distance shoots. So impossible to calibrate on the camera...
I've got this problem only with this lens, I don't understand how a lens can have both front and back focus...
Some of you did ever experiment this problem?
I don't know what to do.
Thank in advance for your help!
Ps sorry for my bad english, I try to do my best!
From France with love!

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