Canon EOS 60D Instruction Manual page 79

If you prefer to look at the LCD panel while selecting the AF point, see
the illustration below.
Automatic selection
right
When using an EOS-dedicated external Speedlite, if focus cannot be
achieved wi h the AF-assist beam, select the center AF point.
AF-Assist Beam with the Built-in Flash
Under low-light conditions, when you press the shutter button halfway,
the built-in flash fires a brief burst of flashes. It illuminates the subject to
enable easier autofocusing.
The AF-assist beam will not be fired in the following shooting modes:
<7> <3> <5>.
The built-in flash's AF-assist beam is effective up to approx. 4 meters/
13.1 feet.
In Creative Zone modes when you pop-up the built-in flash with the <I>
button, the AF-assist beam will be fired when necessary.
Lens' Maximum Aperture and AF Sensitivity
Maximum aperture: Up to f/5.6
With all AF points, cross-type AF sensitive to both vertical and
horizontal lines is poss ble.
Maximum aperture: Up to f/2.8*
With the center AF point, high-precision, cross-type AF sensitive to both
vertical and horizontal lines is possible. The center AF point's sensitivity
to vertical and horizontal lines is about twice as sensitive as the other
AF points.
The remaining eight AF points will work as cross-type points with f/5.6
and faster lenses.
* Except with the EF28-80mm f/2.8-4L USM and EF50mm f/2.5 Compact Macro lenses.
, center
, top
S Selecting the AF Point N
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