Canon EOS R6 Advanced User's Manual page 282

4.
Set the shutter speed, aperture value, and ISO speed.
Press the shutter button halfway and check the exposure level
indicator.
Turn the < > dial to set the shutter speed (1), the < > dial to set
the aperture value (2), and the < > dial to set the ISO speed (3).
Available shutter speeds vary by frame rate ( ).
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