Инструкция для Canon EOS Rebel T5i 18-55mm IS STM Lens Kit

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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 AF* with vertical and horizontal lines detection is 
possible with the center AF point, in addition to the cross-type focusing 
(vertical and horizontal lines detected simultaneously).
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.