Canon EF 400mm f/4 DO IS USM, Инструкция по эксплуатации

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ENG-9
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.
O O
The focused distance will be
preset.
O O
If the focus preset switch was
set to
, the beeper will
sound once.
Press the shutter button
halfway or turn the focusing
ring to focus the distance
you want to preset.
Set the focus preset switch
to ON or .
COP
Y