Canon EF 200-400mm f4L IS USM Extender 1.4x - Manual (Page 9)

ENG-8
5. Focus Preset
By presetting any focusing distance, you can instantly focus at that point even while you are
shooting a different subject. This function operates in any of the AF, PF, and MF modes.
< How to Set >
Press the focus preset
button.
● ● The focused distance will be
preset.
● ● If the focus preset switch was
set to , the beeper will
sound once.
Press the shutter button
halfway to focus the
distance you want to
preset.
Set the focus preset switch
to ON or .
COP
Y