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One of the great things about the controls on the Mark III is that they're so easy to access and use. One of the downsides about the controls on the Mark III is that they are so easy to access and change. In other words, you need to be a little bit careful that you don't accidentally bump the controls on the camera. Now, honestly, I've never run into this problem, but if you find that you are accidentally bumping the controls on the back of the camera, or the top of the camera while you're carrying it around, then you may want to consider using the camera's lock switch. This is the LOCK switch right here. Just move it to the right, and that locks the multi-controller, the main dial, and the quick control dial.
If you have this unset, it's possible to bump these, and possibly change a setting on your camera. For example, by default, if you were to accidentally bump the quick control dial, you could possibly end up dialing in some exposure compensation. That means that anything you shoot from then on, if you weren't paying attention, could be over or under exposed. So if you're finding yourself doing that, just move the LOCK switch over when you're packing or toting the camera. Personally, I have never found these to be a problem. They're pretty sturdy controls, so I never find a need for the LOCK switch, but again, know it's there; it can be handy.
Also, it's possible to reprogram it. It's possible to change what it locks to be just one, or some of these things, and we'll see how to do that when we look at custom functions later in this course.
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