Mirror lockup is enabled with C.Fn-12-1. This prevents mirror-caused vibrations which may blur the image during close-ups or when a super telephoto lens is used. When mirror lockup is set, the camera operates as follows.

Press the shutter button fully.

• The mirror will lock up.
• After 30 seconds, it will go back down automatically.

Press the shutter button fully again.

• The image will be captured and the mirror will go back down.
• To take another shot with mirror lockup, start from step 1 again.

• In very bright light such as at the beach or ski ground on a sunny day, shoot promptly after mirror lockup.
• During mirror lockup, do not point the camera lens at the sun. The sun's heat can scorch and damage the shutter curtains.
• If you use mirror lockup with the self-timer for a bulb exposure, there will be a shutter release sound when you release the shutter button during self-timer operation. This is not the sound of the actual shutter release.
• When using mirror lockup, Remote Switch RS-80N3 (optional) is recommended.
• During mirror lockup, the single drive mode will take effect regardless of the current drive mode setting.
• If the self-timer is used with mirror lockup, pressing the shutter button fully the first time will lock up the mirror, then the shot will be taken 2 seconds later