Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 165)

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Mirror Lockup to Reduce Camera
Vibration Blur
You can use the mirror lockup function to prevent the disturbing mechanical
vibrations (mirror shock) when shooting with super telephoto lenses or
shooting close-ups (macro photography).
Mirror lockup is enabled by setting [Mirror lockup] to [1:Enable] in
[ 5 : Custom Functions(C.Fn)] ( = 449).
1
Focus on the subject, then press the shutter button
completely.
B The mirror will swing up.
2
Press the shutter button completely again.
B The picture is taken and the mirror goes back down.
z After taking the picture, set [Mirror lockup] to [0:Disable] .
Shooting Tips
z Using the self-timer < m >, <
l
> with mirror lockup
When you press the shutter button completely, the mirror locks up. The
picture will be then taken 10 sec. or 2 sec. later.
z Remote control shooting
Since you do not touch the camera when the picture is taken, remote
control shooting together with mirror lockup can further reduce the
camera vibration blur ( = 463).
With Wireless Remote Control BR-E1 (sold separately) set to the 2-sec.
delay, press the release button to lock up the mirror, and the picture will
be taken 2 sec. after the mirror lockup.
With Remote Switch RS-60E3 (sold separately), press the release
button completely to lock up the mirror, and press it completely again to
take the picture.
N