Canon EOS-1D Mark IV - Manual (Page 118)

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Mirror Lockup
Although using the self-timer or Remote Switch can prevent camera
shake, using mirror iockup to prevent camera vibrations (mirror shock)
can also help when you use a super telephoto lens or shoot close ups
(macro photography).
When [.P.C.Fn III -17; Mirror lockup] is set to [1: Enable] or [2;
Enable: Down with SET] (p.226), shooting with mirror lockup is
possible.
1
Focus the subject, press the shutter button completely
and let go of it.
► The mirror will lockup and <Ky> will blink on the top LCD panel.
2 Press the shutter button completely again.
► The picture will be taken.
• With [1] set, the mirror will go back down when the picture is taken.
• With [2] set, the mirror lockup will remain even after the picture is
taken. To cancel the mirror lockup, press <@>.
i
In very bright light such as at the beach or a ski slope on a sunny day,
take the picture 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 bulb exposures, the self-timer, and mirror lockup in
combination, keep pressing the shutter button completely (self-timer
delay time + bulb exposure time). If you let go of the shutter button
during the self-timer countdown, there will be a shutter-release sound but
no picture is actually taken.
When [1: Enable] is set, single shooting will take effect even if the drive
mode is set to continuous. When [2: Enable: Down with SET] is set, the
current drive mode will take effect for the shooting.
When the self-timer is set to or <S)
2
>, the picture will be taken
after 10 sec. or 2 sec. respectively.
The mirror locks up, and after 30 seconds, it will go back down automatically.
Pressing the shutter button completely again locks up the mirror again.
For mirror lockup shots, using the Remote Switch RS-80N3 or Timer
Remote Controller TC-80N3 (both sold separately) is recommended.
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