Question about Canon EOS 400D / Rebel XTi Digital Camera

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Canon auto focus lens will not operate - Canon EOS 400D / Rebel XTi Digital Camera

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If lens has AF/MF switch, make sure it's set to AF. Check/clean connectors between camera and lens. Try with good light source.

Posted on Dec 27, 2014

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Posted on Jan 02, 2017

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SOURCE: my canon eos rebel xt 350d wont focus

change your manual settings

Posted on Oct 11, 2009

  • 1 Answer

SOURCE: auto focus is not working properly and will not

You want to charge people for a membership to get answers from your site
but you want me to "tell you how I did it" for free. Hmmmmmm?

Posted on Sep 10, 2009

  • 11967 Answers

SOURCE: Need Help, the auto focus of my canon 400d won't

Try cleaning the contacts on the camera body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol.

Posted on Oct 14, 2009

  • 11967 Answers

SOURCE: auto focus my canon d1000

Press the shutter button half-way and listen for the beep...then push the rest of the way to take the picture.

Posted on Mar 15, 2010

  • 1 Answer

SOURCE: My Canon Rebel XSi will not auto focus.

Actually what I found to solve the problem was to first set the lens in "MF" and practice taking a picture manually to see if that would work. When I did this, I discovered that the fine tuning portion of the lens was somehow stuck mechanically. I heard a loud click as I turned it. That was all it took to fix the focusing mechanism on the lens. Then I set to "AF" and Voila, the camera worked just fine.

Posted on Apr 29, 2010

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My canon rebel XSi will not auto focus


Actually what I found to solve the problem was to first set the lens in "MF" and practice taking a picture manually to see if that would work. When I did this, I discovered that the fine tuning portion of the lens was somehow stuck mechanically. I heard a loud click as I turned it. That was all it took to fix the focusing mechanism on the lens. Then I set to "AF" and Voila, the camera worked just fine.

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Need Help, the auto focus of my canon 400D won't work.(I can still shot with manual focus)


Try cleaning the contacts on the camera body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol.

Oct 14, 2009 | Canon EOS 400D / Rebel XTi Digital Camera...

1 Answer

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The lens AF mode is not working. What lens is it you are using?

It is not a camera issue but a lens issue. Try a different lens to be certain.

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No extra batteries.

Usually this is a lens fault as the focusing gear is all in the lens. Clicking sounds as if a rear pinion has cracked. It's not uncomon in the 'prosumer' level lenses where plastic gears are used a lot.

It's just possible the fault is which the auto-manual switch. This usually has a mechanical clutch coupled to it which physically disconnects the gearbox from the focusing ring, as well as operating a switch to tell the camera to turn off the AF system.

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I doubt if there is anything you can do yourself. The manual focus may have debris under the ring or is in need of parts. I would leave this one to a tech.

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