Canon EF 400mm f/4 DO IS II USM EF400mm f/4 DO IS II USM Instructions - Page 8
Switching the Focusing, Distance Range, Setting the Focus Mode
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2. Setting the Focus Mode 3. Switching the Focusing Distance Range OO To shoot in autofocus (AF) mode, set the focus mode switch to AF. OO 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. OO To shoot in power focus (PF) mode, set the focus mode switch to PF when the focus preset switch (p. 9) is at OFF. For detailed information, see "6. Power Focus (PF) Mode" (p. 11). You can set the focusing distance range with a switch. By setting a suitable focusing distance range, the actual autofocusing time will be shorter. Ranges FULL (3.3 m/10.83 ft. - ∞) 3.3 m/10.83 ft. - 8 m/26.25 ft. 8 m/26.25 ft. - ∞ After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus) ENG-7