The Canon EOS 40D is a 10.1 MP digital single-lens reflex camera released in August of 2007.

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Why does my Canon EOS 40D camera display error-99?

Why my 40 d dslr camera showing error-99?

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Take a look at this from Canon's Forum: Error 99

Here's another link from a camera repair company: Canon EOS Error 99

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Err 99:

Problem- Various reasons blocking the functioning of the camera.

DIY- Try to turn off the camera and restart it. If that doesn’t work clean the lens and camera body contact points.

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