Question about Canon EOS 400D / Rebel XTi Digital Camera
I swithced to MF but it still auto focus.In dark area I test it to focus(MF mode).But it didnot let me release the Shutter button as it can not focus in that dark place.Both in AF and MF it behaved same.
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Posted on Jan 02, 2017
If you are unable to focus in broad daylight and it just hunts through the whole focus range without locking, then it sounds like a problem with sub-mirror pin (also called the second mirror pin). My 300D just had this problem and I had to send to service to get fixed. I sent to http://www.keh.com/ as they were at least $50 cheaper than going straight to Canon. Just got it backed and it works like a charm again.
Posted on Jul 29, 2007
You need to clean the gold contacts with a soft pencil eraser. Remove the lens, and clean the contacts on it. Then hold the camera so the lens opening is pointing down and clean the contacts on the camera. Ensure no debris gets into the camera body and none is left behind on the lens.
Put it all back together and you should be good to go.
Posted on Mar 24, 2009
SOURCE: Canon AF Issues
Change from auto focus to manual focus or focus using only one focal square and change the setting to One Shot. You may need to shoot in Manual (M) mode though. Any of the "auto" modes will not let you.
Posted on Apr 07, 2009
Then you learn, when everything works fine, dont mess with it! Have a look at the gold pins that rely the body to the lens. Also check that your lens manual switch focus is engaged... Try a friend lens to see if its your cam or the lens...
Posted on Aug 04, 2009
This may not be the same as your issue, but our AF stopped working as well. I tried all the recommended fixes - removing the card and battery, recharging the latter, removing the lens and cleaning the contacts, etc. None of those things worked. However, I then switched to MF, requiring me to turn the barrel, and I realized it was stuck and just needed a little force to get unstuck. Might have been the humidity. Anyway, our problem was solved - AF was back to normal after that.
Posted on Aug 24, 2009
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