Canon EF-M - Manual (Page 30)

The camera automatically sets both the
aperture and shutter speed according to
the brightness values of the main subject
and background measured using evalu­
ative metering.
* If the main subject is not positioned in
the center of the viewfinder frame, we
recommend using partial metering
with AE lock (see page 26).
1) Set both the shutter dial and aperture
dial to
"
0
” .
2) Look through the viewfinder and focus
the subject.