Canon Digital Camera Canon EOS 40D User Manual

4.6

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Owner's of the Canon Digital Camera Canon EOS 40D gave it a score of 4.6 out of 5. Here's how the scores stacked up:

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S Selecting the AF PointN
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.
With lenses whose maximum aperture is larger than f/5.6
With all AF points, cross-type AF sensitive to both vertical and
horizontal lines is possible.
With lenses whose maximum aperture is larger than 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 lenses
brighter than f/5.6.
* Except with the EF28-80mm f/2.8-4L USM and EF50mm f/2.5 Compact Macro lenses.
AF-Assist Beam with the Built-in Flash
Lens’ Maximum Aperture and AF Sensitivity
When looking at the LCD panel to select the AF point, note the following:
Automatic selection , center ,
right , top
If focus cannot be achieved with the external, EOS-dedicated Speedlite’s
AF-assist beam, select the center AF point.
In the <3> <5> <7> modes, the AF-assist beam does not fire.
The built-in flash’s AF-assist beam is effective up to about 4 meters/13.2
feet.
In the Creative Zone modes when you pop-up the built-in flash with the
<I> button, the AF-assist beam will be fired when necessary.

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