104Mirror LockupMirror lockup is enabled with C.Fn-12. (→p.136) This prevents mirror-caused vibrations whichmay blur the image during close-ups or when a super telephoto lens is used. To set thisCustom Function, see “Setting a Custom Function” on page 132. When mirror lockup is set,the camera operates as follows.• When using mirror lockup, Remote Switch RS-80N3 (optional) is recommended. (→p.167)Press the shutter button fully andrelease it.s The mirror locks up, and after 30 seconds, it will goback down automatically. Pressing the shutterbutton fully again locks up the mirror again.1Press the shutter button fully again totake the picture.s The picture is taken and then the mirror goes backdown.2• During mirror lockup, the drive mode will be set to single-frame shooting ( ) tooverride the current drive mode (single or continuous).• If mirror lockup is used with the self-timer, pressing the shutter button fully the firsttime will lock up the mirror and release the shutter 10 seconds or 2 seconds later(depending on the delay time selected).• In very bright light such as at the beach or ski ground on a sunny day, take thepicture promptly after mirror lockup.• During mirror lockup, do not point the camera lens at the sun. The sun’s heat canscorch and damage the shutter curtains.• If you use mirror lockup with the self-timer for a bulb exposure, there will be ashutter release sound when you release the shutter button during self-timeroperation. This is not the sound of the shutter release.
