Sigma 17-50 EX OS HSM (Nikon) w/ defective AF: Repair or Refund???

Started Oct 6, 2012 | Discussions thread
Marvin P New Member • Posts: 3
Re: Enjoy it!

I  just sent my copy of this lens,Canon mount, to Sigma service Center for the second time for AF problem. When this lens works it is great, it takes wonderful photos, but the AF is so erratic. It searches and searches and some times even if it does lock on the photo is or can be out of focus. I bought the lens new in Feb. 2012 from B&H so it is covered for 4 years. First time they replaced GMR sensor ( whatever that is?) and adj AF data. Can't wait to see what they do this time. I have a feeling this lens will travel between me and Sigma for 4 years!!! Took this photo today with AF locked on, using Canon 40D.

AF locked on?

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