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My 18-55mm lens on my canon 450D sometimes does not function or does not auto focus. I have to move the focus with my fingers before it i will function again.

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

Posted on Oct 12, 2010

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1 Answer

Why is my canon xsi suddenly not auto focusing?


Try removing the lens with the camera off and re-mounting it. Before doing so, check to make sure the contacts on the lens and camera body are clean and not damaged. If that doesn't help try gently pressing on the front of the lens (not the glass) while pushing the shutter release button half way down and if it works then you've got a poor fit between the lens and camera body.

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Another cause of auto focus failure is the circuit connecting the moving parts inside the lens. These "Flexi circuits" move with the lens components and wear out after a while. They are cheap enough to find on ebay and easy to replace.

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Auto focus problem


Could be dirty contacts. Remove the lens and clean the contacts on the body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol.

Nov 06, 2011 | Canon EOS 450D Digital Camera

1 Answer

My shutter won't fire using 18-55 lens, either on Manual, P or Auto mode. It is set to AF. But when lens is set to MF, shutter fires. I tried switching to another lens and shutter is perfectly fine.


I could be that your lens isn't focusing. If the Auto focus can't find something to focus on the shutter won't fire. If you are shooting in low light sometimes it has trouble try shooting something that is well lit. also your auto focus point may be somewhere other than the center. there is a button on the top of your camera that looks like this [ ][ ] [ ] [ ]
More or less that will switch where your focus point is. If you look in the view finder and see a red dot when you push on the shutter button that is your focus point. push the above button until the red dot is in the centre. that may fix your problem.

Jul 26, 2011 | Canon EOS 450D Digital Camera with 18-55...

1 Answer

My camera eos 450 d not auto focus and not live view


hi your camera body doesn't have live view function. About auto focus you should check lens AF/M switch position. and still not working? then would you let me know more detail how does not work? (like any noise, or broken gear) Actually canon bundle lens has a lot problem. what kind of lens you have? etc.. Thanks and best regard!

May 25, 2011 | Canon EOS 450D Digital Camera

2 Answers

Auto Focus Not Working


I had a same problem, Auto Focus works in all the Basic modes but it did not work in Advanced and Manual modes.  After couple of hours of frustration I found the solution. It worked for me, I hope it will work for you too.
Follow step by step instructions. Start the Camera
Go to M (Manual Mode) Press Menu Button Go to 6-th Tab Custom Functions (C.Fn) Select Clear settings Select Clear all Custom Func. (C.Fn)
This should fix your problem
Go back to shooting more and try your Auto Focus

Jan 06, 2009 | Canon EOS 450D Digital Camera

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