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Canon EOS 40D Guide to Digital Photography by David D. Busch

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C.Fn III-07: Whether It Is Possible to Lock Up the Viewing Mirror Prior to an Exposure

Mirror lockup

The Mirror lockup function determines whether the reflex viewing mirror will be flipped up out of the way in advance of taking a picture, thereby eliminating any residual blurring effects caused by the minuscule amount of camera shake that can be produced if (as is the case normally) the mirror is automatically flipped up an instant before the actual exposure. When shooting telephoto pictures with a very long lens, or close-up photography at extreme magnifications, even this tiny amount of vibration can have an impact.

You’ll want to make this adjustment immediately prior to needing the mirror lockup function, because once it’s been enabled, ...

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