Canon 6558B003 Manuale Utente

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 Selecting the AF PointN
With maximum apertures up to f/5.6:
Cross-type focusing (vertical and horizontal lines detected 
simultaneously) is possible with all AF points. With certain lenses (see 
below), the off-center AF points will detect only vertical or horizontal 
lines (no cross-type focusing).
With maximum apertures up to f/2.8:*
High-precision cross-type focusing (vertical and horizontal lines 
detected simultaneously) is possible with the center AF point. The 
center AF point is about twice as sensitive as the other AF points to 
detect vertical and horizontal lines.
The remaining eight AF points enable cross-type focusing in the same 
way as when using lenses with maximum apertures up to f/5.6.
* Except with the EF28-80mm f/2.8-4L USM and EF50mm f/2.5 Compact Macro.
The following lenses enable only horizontal-line sensitive focusing with 
the three AF points on the left and the three AF points on the right and 
only vertical-line sensitive focusing with the top and bottom AF points. 
Cross-type focusing is possible only with the center AF point.
EF35-80mm f/4-5.6
EF35-80mm f/4-5.6 II
EF35-80mm f/4-5.6 III
EF35-80mm f/4-5.6 USM
EF35-105mm f/4.5-5.6
EF35-105mm f/4.5-5.6 USM
EF80-200mm f/4.5-5.6 II
EF80-200mm f/4.5-5.6 USM
AF Operation and Maximum Lens Apertures
Lenses not Enabling Cross-Type Focusing with all AF Points
If you use an Extender (sold separately) and the maximum aperture 
becomes smaller than f/5.6, AF shooting will not be possible (except in 
[u+Tracking], [FlexiZone - Multi], and [FlexiZone - Single] during Live 
View shooting). For details, refer to the Extender’s instruction manual.
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