Question about Canon EOS 400D / Rebel XTi Digital Camera with 18-55mm Lens

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Autofcous and manual focus do not work

Autofocus mode tries to turn the lens but nothing happens. A green light to the right of a number 9 in the bottom right of the view finder blinks and the camera does not allow the picture to be taken. When the lens is switched to manual focus it still will not focus, and the distance scale on the lens dose not move. The picture can be taken but is, of course, out of focus. The lens is a Cannon EF 50mm 1.4.

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  • Anonymous Mar 29, 2009

    i have exactly the same problem

    i do't know wat 2 do

    it is just now focusing

  • daveconforti Apr 06, 2009

    i have the same problem, I am able to adjust the focus manually and take pictures; however when in auto focus, the lens focuses, then flashes a green light and will not take a picture. Any suggestionis?

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  • 153 Answers

Excuse me if this is a dumb question but you wouldn't believe the things people do...., but in manual mode are you actually manually trying to move the lens? as manual mode means just that you take hold of the lens and turn it. If it wont turn it sounds like the lens is jammed and needs returning/repairing.

if taking hold of the lens and turning it works for manual mode, take the lens off and clean the gold contacts on both the camera and the lens with a pencil erasor this may bring the auto focus back to life, switch back to auto and try again, if not its most likely the lens but take the body to a canon store and try another lens just to double check the body is ok

drop me a line if i can be of further assistance

best of luck

Posted on Jun 09, 2008

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Use autofocus if you have a AF lens on it.

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The 9 you see is the maximum "burst" which is (pictures made in rapid succession) and is not an issue with your problem at this time the flashing green dot is the in focus confirmation light and it's good that you are seeing this as we will use it to remedy the problem.
Diagram
tri3mast_180.jpg

Manual focus switch
Diagram here
tri3mast_181.jpg
What I want you to do is put the AF-MF switch in the manual mode if it's already in manual mode then that was your problem switch to AF and go take some pictures. If it's in AF mode switch to MF make sure teh camera is on and look through the viewfinder at a subject say 15 feet (4.5 meters) away something that has contrast then turn the manual focus ring on the camera slowly until it appears to your ey that it's coming into focus when it's in focus the green light will come on solid, now you know what you are looking for focus an several different objects at different distances and focus manually. Now switch the lens over to AF (auto focus) and focus on the same thing but let the camera do the focusing What auto focus will not focus on in something with little or no contrast like water clear blue sky a painted wall mirror chrome glass and a few other things.
Here is another diagram to check make sure you are in the correct mode.
Diagram
tri3mast_182.jpg
Now for the focus point in the viewfinder make sure it's in the center position.
tri3mast_183.jpg
To adjust the focus point do this
tri3mast_184.jpg
Once you have the camera set to the center focus point and the correct AF mode (one shot) auto focus should return to your camera. Have fun Robert from London Ontario Canada

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