Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
If a lens won't autofocus it's either because the mechanics of the lens are broken or it's unable to communicate properly with the camera. Most of the time it's the latter. The first thing to try is use a pencil eraser on the gold-coloured contacts on the lens's "camera side", being careful not to get any little pieces inside. If that doesn't work then your lens's connectors may have come apart on the inside and that would require professional repair. Good luck!
Posted on Aug 08, 2010
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Posted on Jan 02, 2017
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