The EOS 40D takes some of the most advanced features from Canon's professional cameras and incorporates them into its design. It has a newly designed, high-precision 9-point wide area AF that uses cross-type points with lenses f/5.6 or faster, enabling the camera to focus faster, more accurately, and in ever more complex lighting. Each of the nine AF points has this cross-type coverage, a first in Canon AF SLRs. Adding to this AF performance, the 40D incorporates a diagonally mounted, high-precision cross-type sensor at the center AF point that is sensitive to both vertical and horizontal lines when fast lenses (f/2.8 or faster) are used, for for added accuracy and precision with these wide-aperture lenses. It's the world's first AF SLR where both lines of a cross-type sensor offer high-precision AF coverage. All focus points can be chosen automatically, or accessed using the 40D's intuitive, thumb operated Multi-Controller.
9-point Cross AF
AF Point Configuration
With some lenses, the peripheral AF points may become sensitive to either vertical or horizontal lines (they will not function as cross-type AF points). These lenses are: EF 35-80mm f/4-5.6, EF 35-80mm f/4-5.6 II, EF 35-80mm f/4-5.6 III, EF 35-80mm f/4-5.6 USM, EF 35-105mm f/4.5-5.6, EF 35-105mm f/4.5-5.6 USM, EF 80-200mm f/4.5-5.6 II, EF80-200 f/4.5-5.6 USM.