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As you already know, when I half press the Shutter button my camera autofocuses and meters. But there will be times when you want to meter and focus separately and there's a custom function that can help change the controls on your camera to make that a little bit easier. Custom Function #9 Shutter/AE lock button gives me four different options, and with each option I've got an item and then a slash and then another item. The first item is telling me what the function of the Shutter button will be, the second item is telling me what the function of the AE lock button will be, the one right here with a little asterisk over it.
So by default I've got my shutter's autofocused and my AE lock button is Auto exposure lock. You've seen how those work. But if I switch down here to option #1, now my shutter -- it's basically I'm reversing -- now my Shutter is AE lock and this button is autofocus. So now I've got Exposure lock up here, focus back here. If I go down here to the second option, I go back to autofocus on my Shutter button, but now I also have autofocus back here and I get no Auto exposure lock ever.
What this is for as when I'm shooting in AI Servo focus mode and the camera is tracking a moving object. This gives me the ability to stop it from autofocusing by pressing this button. When I release this button it will start again, so this gives me a way of working around something moving between me and the moving subject that I'm trying to focus on. Finally, there is a fourth option here, which is AE/AF, no AE lock. This is the same as the third one except I do get Auto exposure lock on my Shutter button.
This is good for subjects which keep moving and stopping. I can start and stop Servo focus with my AE lock button back here, but I still get Exposure lock up here which means my exposure will be set right at the moment that I press the Shutter button all the way down. For the most part you'll probably find that you stay with your normal functioning if that's what you're used to. Although for certain situations you may want to go to the second option for having separate control of exposure in autofocus. If you do a lot of Servo shooting fiddle with these and see if you get one that works better for your subject matter.
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