Sigma 17-50 mm f2.8 EX HSM OS (Nikon mount) Focus Hunting: DIY Repair?

Started Jan 2, 2014 | Discussions thread
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PauloP New Member • Posts: 3
Sigma 17-50 mm f2.8 EX HSM OS (Nikon mount) Focus Hunting: DIY Repair?


Almost 2 years ago I have purchased a Sigma 17-50 mm f2.8 OS to use with my Nikon D5000.

During the first year of its life this lens has performed amazingly well. I loved every aspect of it. Back at that time, I wondered why people would spend that much more for a Nikkor unit.

One year later I've found why.

After this one-year period of perfect marriage, the unit started to suffer from a terrible focus hunting, even in bright light.

I've cleaned its contacts, tested some other units, reset the camera and came to the conclusion that the Sigma was in fact defective.

I would send it to repair if possible, but I do not live in the US, and I've bought it there. My country also does not have official Sigma support, so I wonder if I can try to repair it myself. I have succeeded to disassemble it partially (perhaps 50% of it), but I've found nothing strange so far, at least when it comes to its connections.

I'm very disappointed with Sigma quality. I barely used this lens. Never took it to harsh enviroments. I really regret having buying this over the Nikkor equivalent.

Thanks for any help.

Nikon D5000
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