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If you're shooting a longer shutter speed then you've probably got your camera mounted on a tripod. You might even be using a remote control so that your hands aren't on the camera and introducing camera shake. If you want to be absolutely sure that you've got as steady a shot as you possibly can get, you might want to tell the camera to lock up its mirror. The mirror that we saw earlier in the mirror chamber as it flaps up and down can introduce a little bit of vibration to the camera. I'm going to go here into Custom Functions and Custom Function #8 Mirror Lockup. I'm going to take that off Disable and put it on Enable.
This changes the way the camera works when I'm shooting. Now when I press the Shutter button, the mirror goes up, but I have not actually taken a picture and the mirror is still up. If I press the button to rest or press the button again rather, now it's taking my eight second exposure and when it's done the mirror will come back down. Note that it does stay in Mirror Lockup mode, so the next time I take a picture the same thing is going to happen. So when you're done shooting this way, you want to be sure that you come in here and say disable Mirror lockup. So again, this is a great feature if you're shooting skies at night or anything else where you're doing very long exposures and want to be sure that you don't have extra blur in your image from a shaky camera.
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