Canon EOS 80D - Manual (Page 219)

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Camera vibrations caused by the mirror’s reflex action when the picture
is taken is called “mirror shock”. Mirror lockup keeps the mirror up
before and during exposure to reduce blur caused by camera
vibrations. Useful when shooting close-ups (macro photography), using
a super telephoto lens, and shooting at slow shutter speeds.
1
Set [Mirror lockup] to [Enable].
 Under the [z4] tab, select [Mirror
lockup], then press <0>.
 Select [Enable], then press <0>.
2
Focus on the subject, then press
the shutter button completely.
 The mirror will swing up.
3
Press the shutter button
completely again.
 The picture is taken and the mirror
goes back down.
2
Mirror LockupN
 Do not point the camera toward an intense light source, such as the sun or an
intense artificial light source. Doing so may damage the image sensor or the
camera’s internal components.
 In very bright light, such as at the beach or a ski slope on a sunny day, take
the picture promptly after mirror lockup is stabilized.
 If you use the self-timer and bulb exposure in combination with a mirror
lockup, 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 will be taken.
 During mirror lockup, shooting function settings and menu operations, etc. are
disabled.