Sigma Acknowledges Auto-Focus Problems in Some Recent Lenses - Offers Fix
There's little worse than getting a new piece of gear and having it fail on you. It's especially bad if it's a high-end lens. But that's just what's happened to some Sigma lens owners.
According to the company, there are autofocus details in certain lenses that could greatly impair their use. But Sigma is owning up to the error and offering a modification service to customers with the defective lenses - free of charge.
If you've got a Sigma lens that matches the serials listed below, you can contact Sigma directly to get the problem taken care of. If you're living in the US, the number is (631)585-1144. If you're outside the states, you can visit the website to find a list of Sigma service centers.
APO 50-500mm F4.5-6.3 DG OS HSM: 10633051 - 10972000
APO 120-400mm F4.5-5.6 DG OS HSM: 10574001 - 10972000
APO 150-500mm F5-6.3 DG OS HSM: 10674301 - 10972000