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In the last movie you saw how when I half-press the shutter button the camera auto focuses. But it also does something else very important, and that is it meters the scene. In other words, it analyzes the light in the scene and calculates a shutter speed and aperture, and possibly an ISO setting, that will give me good overall illumination for my scene. After it does that, it tells me what they are. So I am going to half-press the shutter button here, and you can see up here that it has chosen a 40th of a second at F4. It's also going to show those readouts inside the viewfinder, in the status display that sits just underneath the image in the viewfinder.
So this is pretty critical information to have while I am shooting, because if my shutter speed is too low, I'm going to worry about handheld shake. In general, if your shutter speed drops much below a 60th of a second then you need to start thinking about trying to stabilize the camera or you need to take some exposure control to get yourself into a better shutter speed. If you don't understand this, you can learn all about these issues in my Foundations of Photography: Exposure course. Now, through the rest of this course, we'll be looking at all the different exposure controls you have, from changing shutter speed and aperture to adjusting ISO, and the types of controls you have in different modes on the camera.
For now, if you're just getting started, your main thing is to really develop the habit of every time you meter, taking a look at the shutter speed number. If it's below 60, then you need to think about handheld camera shake and work hard to keep the camera extra steady.
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