Question about Canon EOS 40D Digital Camera

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My auto focus lenses have stopped foucusing. battery is fresh and auto focus is on. Is auto focus the lens or the cameraor both?

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Go to your main menu and shop around, you'll find an option to "Reset to factory defaults" click that and you'll be all set.

Posted on Sep 06, 2009

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1 Answer

Auto focus stopped working


Try cleaning the contacts on the camera and the lens, this is what usually prevents AF from working correctly.

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It sounds like the circuit board flex has gone bad, It folds back and forth when you zoom the lens, And needs to be replaced by a repair shop and readjusted. Tony

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The F/stop isn't supposed to change when you focus. Depending on the camera, you change the f/stop by either turning the aperture ring on the lens or turning a command dial on the camera body.

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1 Answer

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Talked to canon support, they suggested to send lense in for review/repair. They said it could be the motor, I think it was a gear problem based on the noises and jerkiness of the focusing action while in manual focus (manual focus gave out as well). Cost TBD - "would definately be more than $50. I shopped around and elected to buy a new lense rather than try to hassle with the repair, shipping, insurance, and the wait, etc. Besides, I have a deadline that I need the lense for, so repair at Canon really became a non-option. I think the cost would've been pretty much the same in the end as the new lense, since this wasn't one of the costlier of lenses to begin with.

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Nikon D40X stopped auto-focusing yesterday


I had the same problem. My issue was with all my lenses. I solved it by going to the menu and selecting the custom setting menu (pencil icon). Then from the right menu select the AE-L/AF-L and press OK. Then make sure it is set on AE/AF Lock. Presto...all my lenses worked on auto-focus.

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How does it stop working? Do you mean it doesn't auto focus anymore?
Many longer focal length lenses wont auto focus with 2x teleconverters on them.

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