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It may seem strange to devote an entire movie just to turning your camera on, but a lot of things happen when you power up your camera, and it's important to understand what they are, and how you can alter them. One of the most important things that happens when you turn the camera on has to do with the image sensor that sits inside the camera. Because the lens of the camera is removable, it's possible for dust to get inside the camera body, and then get on the sensor, and if that happens, you're going to see smudges, and spots, and things on your image. There is a clear filter that sits in front of the image sensor, so dust never actually gets on the sensor itself; it gets on that filter.
When you turn the camera on, it shakes the filter at a really high speed to shake off any dust, and there's a little sticky substance or something beneath the filter that traps any dust bits that fall off. The power switch on your Mark III is located right here underneath the Mode dial. You're going to want to watch this closely; I'm going to move it to the ON position. Now watch what's happening back here. On my rear screen, I get this Sensor cleaning screen; that indicates that the sensor is being shaken. And as I mentioned before, there's a little sticky substance down here at the bottom, so any dust that falls off will hopefully stick to that, and not float around inside the mirror chamber.
I'm going to turn the camera off, and again, I get the Sensor cleaning message. So the camera cleans its sensor every time you turn the camera on or off. Now, if you're worried that that sensor cleaning could interrupt your shooting, don't, because it's something you can stop with just a half-press of the shutter button. So in the middle of the cleaning cycle, I did the half-press, and it immediately stopped the cleaning, and the camera was ready for shooting. So the camera is always in a shooting priority mode. Later you'll see that you can change these cleaning parameters. You can set it to clean either when you turn the camera on or off, or you can disable cleaning altogether.
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