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Sigma 17-70 autofocus problems with 550D

Started Aug 31, 2014 | Discussions thread
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Esinem New Member • Posts: 3
Sigma 17-70 autofocus problems with 550D

A little history first before I get to the problem: I have just got my 550D back from Fixation after checking the 18-55mm kit lens and body for autofocus problems. It looks like I knackered the kit lens by forgetting to switch to manual before engaging follow focus *blush* on my rig. They also did some work on the AF and cleaned the camera. All now works great with my 1.8mm 50mm Canon lens, even in bad light.

I recently bought a barely used 2nd hand Sigma 17-70 (private sale, sold as seen). Autofocus seems erratic, especially under 1 metre. It will hunt for ages, often clearly by-passing the focus point, and then quite often settle totally out of focus. It seems much the same in LiveView and thru the v/f regardless of focal length.

Has anyone else seen this behaviour or know what's up? Could it be a question of some inexpensive recalibration or is it more serious?

I'm guessing I bought a lemon so need to run it into Fixation for a nice fate repair bill but good news is always welcome

Canon EOS 550D (EOS Rebel T2i / EOS Kiss X4) Sigma 17-70mm F2.8-4 DC Macro OS HSM | C
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