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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. This 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 any dust, and there's a little sticky substance or something beneath the filter that traps any dust bits that fall off. You power up your D800 using the power switch, which is located right here, around the shutter button. This is really nice because if you're carrying your camera by the grip, you've just always got access to the power button. Now, your camera will doze off. If you're not shooting, you could always wake it back up with a press of the--a half-press of the shutter button. So you don't have to worry about turning it off and on all the time to conserve battery.
For a day of shooting, you can turn it on and leave it there and trust that it's going to do a good job of managing its own power. The interesting thing about the power switch is after the on switch, there's another position that's kind of spring-loaded. If I pull it on over to here, that turns on the light for the status display. You can't see that right now because of the lights that we've got it under. Another press there turns it back off. I can actually reprogram this to do something else, and we'll look at how to do that in a later movie. When I turn the camera on, it goes through a sensor-cleaning process.
It shakes that anti-aliasing filter that's sitting in front of the image sensor. You don't see any readout of that on the display anywhere; just trust that it's doing it. And it's never going to get in the way of your shooting. Even if it's in the middle of the cleaning cycle, after you turn the camera on and you immediately go to shoot, it's going to stop doing that and put you back into shooting mode. You can change the cleaning behavior though, and we'll see how to do that later when we talk about customizing the camera.
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