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I updated the firmware in my Nikon D5500, now the autofocus doesn't work. It still works with manual focus and the pictures are sharp, but it's a hassle without the autofocus. I recently learned these older Sigma lens may have issues with firmware updates on Nikon because the lens are reversed engineered, so Sigma doesn't pay Nikon for the technology to work properly sometimes with the firmware updates. Not happy about that.
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