Canon EF 400mm f/4 DO IS USM Instructions Manual - Page 10
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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 >
Set the focus preset switch
to ON or
.
Press the shutter button
halfway or turn the focusing
ring to focus the distance
you want to preset.
Press the focus preset
button.
O
O
The focused distance will be
preset.
O
O
If the focus preset switch was
set to
, the beeper will
sound once.
ENG-9