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Old Jul 7, 2006, 7:33 PM   #1
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Join Date: Jan 2006
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Can someone explain what the mirror lockup is used for on my Canon 20D.
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Old Jul 7, 2006, 9:03 PM   #2
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Long exposures and macro images are subject to blurring due to camera shake. Assuming that your camera is tripod mounted, there are two sources of movement: the inertia of the mirror flipping up out of the light path, and the photographer depressing the shutter button.

In normal operation, your camera is subject to both. The combined use of mirror lockup and self timer results in a 2-second delay in the image being captured. The mirror immediately flips up, and the 2-second delay damps the mirror vibration and eliminates the camera movement may have occured from depressing the shutter.

A good tripod helps a lot too!

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