Setting The Focus Mode - Canon EF28 Instruction

2. Zooming

3. Setting the Focus Mode

To zoom, turn the lens' zoom ring.
Be sure to finish zooming before focusing. Changing the zoom ring after
focusing can affect the focus.
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)
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