Canon EOS 20D 取り扱いマニュアル

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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)].

s

The mirror will swing up.

s

The picture is taken and the mirror 
goes back down.

N

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In very bright light such as at the beach or ski ground on a sunny day, 
take the picture promptly after mirror lockup.

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During mirror lockup, do not point the camera lens at the sun. The sun’s 
heat can scorch and damage the shutter curtains.

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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).

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During mirror lockup, the drive mode will be single shooting regardless of 
the current drive mode (single or continuous).

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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.

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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.

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For bulb exposures, using Remote Switch RS-80N3 or Timer Remote 
Controller TC-80N3 (both optional) is recommended.