12-12-2014 11:58 AM - last edited on 12-12-2014 12:10 PM by Jason
My rebel t1i will not take pictures if switched to Af on lens. It keeps trying to focus but unable to push shutter down and take pic. I've tried two different lenses. I have also done sensor cleaning. Camera will take pic when switched over to mf. Help!!
12-12-2014 01:34 PM
12-12-2014 05:59 PM
^^ This
But also... switch the camera to "live view" mode. Live view uses a different focusing system than the normal through-the-viewfinder mode.
If you are having a problem with the phase-detect focus sensors (btw, you should test by picking each individual point in the AF array to see if some work while others fail) then switching to live-view would let you bypass the phase-detect system. Live-view uses "contrast detect" focusing and ignores the phase-detect array.
If you also have a problem with live-view then the issue may be with the lens.
The camera will not take a shot when using auto-focus in "One Shot" mode UNLESS you can lock focus on at least one AF point. This feature is called "focus priority" (requiring a focus-lock before it'll take a picture). If you switch the lens to manual focus then the feature is disabled. ALSO... if you switch to AI Servo focus the camera behavior switches to "release priority". "Release Priority" requires that the camera takes the picture when you fully press the shutter button... and it will do this whether the lens has had a chance to focus or not (most often used for action photography becuase it will will continuously refine focus while you track a subject... but when you fully press the shutter button you want the camera take the shot at that moment.
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