Question about Canon EOS 550D Rebel T2i Digital Camera
With the lens setting on AF I cannot autofocus when pressing shutter button halfway
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Posted on Jan 02, 2017
It's possible that the reason the "pictures turn out fairly good" is that your f-stop is set high enough that even though the image isn't properly focused, you have enough depth-of-field to bring your subject into "near focus". Does your lens try to focus back and forth when you half-press the shutter? If not, double check that the lens is in autofocus and not manual focus. You can also try cleaning the contacts between the lens and camera. Take the lens off, and then one-at-a-time clean the contacts on both the lens and the camera, using a clean pencil eraser. Gently rub the contacts. Be sure to hold the item upside down so that the eraser debris falls on to the table, not into the camera body or lens!
If none of this helps the autofocus may have become damaged and you need to have the lens and camera looked at by Canon Repair.
Posted on Jan 11, 2009
SOURCE: AF problem in CANON 350D
This is a problem with the mirror and the sensor. Have you out the camera in sensor clean mode? turning the camera to P then use the menu buttons to go to the second set of tool. clean sensor is there. You must have a good battery charge for it to work. take off the lens then hold the camera face down and activate the sensor. This did not work for me but this was one of the suggestions, if the mirror does lift back up when you put the camera in sensor clean mode then it is not the hinge that some are paying to be replaced. I took my camera and oddly enough turned it upside down in af mode in auto mode and it started shotting photos and focusing again. i did this about ten shots and when I put it back right side up everything worked fine! Try it and let me know.
Posted on Sep 08, 2009
I have this prob in my canon EOS kiss SLR.
Hold the camera vertically.Switch on the AF and let the camera to auto focus.!!!!!!!!!!!!!!!!
Don't wondering....Check ur camera's sub mirror in the in side of the sub mirror.The spring that push back sub mirror from the main mirror is broken.......!
How to repair this? Follow this link....
Posted on Nov 04, 2009
Mirror lockup is probably enabled. You can disable it by going into Menu and then Custom Functions. Select Mirror lockup and disable it.
Posted on Jul 15, 2010
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Choose how the camera focuses.
A (auto) M d (Shooting menu) M I Autofocus mode
A Single AF (default setting)
The camera focuses when the shutter-release button is pressed halfway.
B Full-time AF
The camera focuses continuously until the shutter-release button is pressed down
halfway. Use with moving subjects. The sound of lens drive movement will be heard
while the camera focuses.
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