Canon EOS 20D - Manual (Page 88)

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Mirror lockup is enabled with C.Fn-12 [Mirror lockup] set to [1: Enable]
(p.144). The mirror can be swung up separately from when the
exposure is made. This prevents mirror vibrations which may blur the
image during close-ups or when a super telephoto lens is used. Set
Custom Functions with [
c Custom Functions (C.Fn)].
1 Press the shutter button
completely.
s The mirror will swing up.
2 Again press the shutter button
completely.
s The picture is taken and the mirror
goes back down.
Mirror Lockup
N
¡ In very bright light such as at the beach or ski ground 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 (2 sec. self-
timer + bulb exposure time). During the self-timer countdown, if you let
go of the shutter button, there will be a shutter-release sound. This is not
the shutter release (no picture is taken).
¡ During mirror lockup, the drive mode will be single shooting regardless of
the current drive mode (single or continuous).
¡ If you use the self-timer and mirror lockup, the shot will be taken 2 sec.
after the mirror goes up when you press the shutter button completely.
¡ 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 bulb exposures, using Remote Switch RS-80N3 or Timer Remote
Controller TC-80N3 (both optional) is recommended.