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In this course, photographer and author Ben Long details the features, controls, and options in the Canon 5D Mark III digital SLR. The course begins with an overview of what a digital SLR is and takes a tour of the camera's basic components. Ben then discusses the camera's basic operation: changing lenses, navigating the menus, shooting in automatic mode, reviewing and managing photos on the camera's LCD screen, and transferring photos to a computer.
Next, the course introduces more advanced exposure options: program mode, exposure compensation, ISO adjustments, and more. After Ben briefly defines each option, he shows how to adjust it using the camera's controls.
Ben also discusses white balance options, advanced metering and autofocus controls, flash, live view, and video shooting. The course ends with a chapter on maintenance, including sensor- and camera-cleaning and care tips.
As you've seen, when you half-press the shutter button, the camera autofocuses, meters, and possibly calculates white balance, and ISO, depending on your camera settings. When the camera has decided on all of those parameters, it beeps, and it flashes a light in the Viewfinder. If you want, you can continue to hold the button down at the halfway point while you reframe your shot. Now, this is sometimes necessary to get the focus and metering that you want. Once you're ready to take the shot, you can press the button the rest of the way. So once again, metering is very simple.
I just press -- half-press the shutter button, and when I hear that beep, that means that the camera has metered, and autofocused, and I see my metering readings inside the Viewfinder; in this case, it's 1/200 at f/4.5. Now, one bit of very important metering behavior on your camera: when you half-press that shutter button to meter, as long as you hold the button down, the camera will hold that same metering, even as you pan around to areas that might be brighter or darker than where you originally metered.
If you half-press the button to meter, like I'm doing right now, and let go of the button, the camera will hold its metering, but as you move it around, it will re-meter on the fly. So then I can change my position, press the button down again, it will have the metering -- it will meter those same values that I'd already seen, it will focus, then I can press the button the rest of the way to take a shot at that particular metering. So it's a way of previewing metering as I pan the camera around. So it's very important to understand the difference between these two things.
Eventually, once you've half-pressed the button, and let go, the camera will time out, and the metering screen will go blank, and it will go back to its default position of not having any metering at all.
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