New answers tagged live-view
Assuming there's nothing wrong with the camera itself (possible), there are a few settings to check. Hit the Menu button, go to the Setup menu (third icon), and select the Buttons item. There should be an option to set the behavior of the AF-L/AE-L button. When this is set to AF-ON, the button activates the focus, and the shutter release does not autofocus....
Live view mode uses contrast detection to achieve focus. This means that if you try and focus on an area with low contrast, it can have trouble focusing. You can either switch to manual focusing (and zoom the LCD view to help achieve sharp focus), or move the point to an area with good contrast (ie an area with a dark area next to a light area).
I'm assuming it is seeking wildly without ever finding focus, right? Are you sure there's enough contrast for phase-detect autofocus to work reliably? Beyond that, it is possible that the lens is decentered or that it just has issues with the AF system in that particular camera. Regardless of the underlying cause, it is probably worth telling the 6D to ...
It may be that you are experiencing what is often the downside of using an older third party lens on a newer camera body: AF incompatibility. Lens makers such as Tamron do not license technology from camera makers such as Canon to insure compatibility. Instead they reverse engineer the technology in order to design compatible lenses. When a manufacturer such ...
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