Canon EF 200-400mm f/4L IS USM Extender 1.4X User Manual - Page 7

2. Setting the Focus Mode 3. Switching the Focusing Distance Range 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. To shoot in power focus (PF) mode, set the focus mode switch to PF when the focus preset switch (p. 8) is at OFF. Operating the playback ring enables focus change at a set speed. This is a useful feature for changing focus when shooting movies. After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus) 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 1. FULL (2 m/6.56 ft. - ∞) 2. 2 m/6.56 ft. - 6 m/19.69 ft. 3. 6 m/19.69 ft. - ∞ ENG-6