Canon eos 40d 1901b014 User Manual

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Although using the self-timer or Remote Switch can prevent camera 
shake, using mirror lockup to prevent camera vibrations can also help 
when you use a super telephoto lens or shoot close ups.
When [8C.Fn III -7] (Mirror lockup) is set to [1:Enable] (p.160),
shooting with mirror lockup will be possible.

X

The mirror will swing up.

X

The picture is taken and the mirror goes back down.

N

 

In very bright light such as at the beach or 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 2-sec./10-sec. self-timer countdown, there will be a shutter-
release sound. This is not the actual shutter release (no picture is taken).

 

When [1:Enable] is set, single shooting will take effect even if the drive 
mode is continuous.

 

When the self-timer is set to <

j> or <l>, 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.

 

For mirror lockup shots, using Remote Switch RS-80N3 or Timer Remote 
Controller TC-80N3 (both sold separately) is recommended.