Sigma 50mm 1.4 Disaster

Well, this will teach me to stick with Canon lenses.

I read glowing reports about the Sigma and bought one. In the middle of a shoot today, it turned into a manual focus lens. It wasn't the camera, as I tested the lens on another camera, and tested another lens on this one.

Dead. That's what it is. No autofocus.

I bought it at B&H, about 2 months ago, and I can't find any of my paperwork, or the warranty card.

Lovely.