Setting The Focus Mode - Canon EF16-35mm f/4l IS USM Instructions Manual

2. Setting the Focus Mode

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. Zooming
To zoom, rotate the zoom ring.
Be sure to finish zooming before focusing. Zooming
after focusing can affect the focus.
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