Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 109
AF Operation and Maximum Lens Apertures, Maximum Lens Aperture: f/3.2 - f/5.6
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AF Area Selection ModesK AF Operation and Maximum Lens Apertures Maximum Lens Aperture: f/3.2 - f/5.6 With all AF points, cross-type AF sensitive to both vertical and horizontal lines is possible. However, with the lenses below, the peripheral AF points will detect only vertical or horizontal lines (no cross-type focusing). Lenses that Do Not Support Cross-Type Focusing with Peripheral AF Points Cross-type focusing Vertical line-sensitive focusing Horizontal line-sensitive focusing Cross-type focusing at the < > and < > AF points is not possible with the following lenses: 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 Maximum Lens Aperture: f/1.0 - f/2.8 Besides cross-type focusing (vertical and horizontal lines detected simultaneously), the center AF point can also perform high-precision, vertical-line sensitive AF.* The remaining 18 AF points perform cross-type focusing, as with the maximum aperture at f/3.2 - f/5.6. * Except with the EF28-80mm f/2.8-4L USM and EF50mm f/2.5 Compact Macro. 109