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Questions about a specific problem or issue, often dealing with a lens, camera body, image sensor, lighting equipment, or software specific to photography.

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How do I troubleshoot Canon EF100-400L IS USM failure?

I use my EF100-400 on a Canon 10D. While in IS and auto focus mode, I was shooting a soccer match when the lens abruptly failed to focus, and I got an error message on the camera. I turned off the ...