Focus Mode Switch; Focusing Ring - Canon EF 400mm f/2.8L IS USM Instructions Manual

2. Setting the Focus
Mode
AF
MF
STABILIZER STABILIZER
ON OFF
To shoot in autofocus (AF) mode, set the focus
mode switch to AF.
To shoot in manual focus (MF) mode, set the
focus mode switch to MF, and focus by turning
the focusing ring. The focusing ring always
works, regardless of the focus mode.
After autofocusing in ONE SHOT AF mode, focus
manually by pressing the shutter button halfway
and turning the focusing ring. (Full-time manual
focus)
3. Switching the Focusing
Distance Range
2.5m
AF
MF
You can set the focusing distance range with a
switch. By setting a suitable focusing distance
range, the actual autofocusing time will be shorter.
Lens
EF300mm f/2.8L IS USM
EF400mm f/2.8L IS USM
EF500mm f/4L IS USM
EF600mm f/4L IS USM
2.5m 6.4m
6.4m
Ranges
2.5 m/8.2 ft. – ∞
2.5 m/8.2 ft. – 6.4 m/21.0 ft.
6.4 m/21.0 ft. – ∞
3 m/9.8 ft. – ∞
3 m/9.8 ft. – 10 m/32.8 ft.
10 m/32.8 ft. – ∞
4.5 m/14.8 ft. – ∞
4.5 m/14.8 ft. – 10 m/32.8 ft.
10 m/32.8 ft. – ∞
5.5 m/18.0 ft. – ∞
5.5 m/18.0 ft. – 16.2 m/53.2 ft.
16.2 m/53.2 ft. – ∞
ENG-5