Lens Maximum Aperture and AF Sensitivity

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The EOS 20D will execute high-precision AF with lenses whose maximum aperture is f/2.8 or larger.

With lenses whose maximum aperture is f/2.8 or larger

With the center AF point, high-precision, cross-type AF sensitive to both vertical and horizontal lines is possible. With cross-type AF, vertical-line detection is twice as sensitive as horizontal-line detection. The other eight AF points are horizontal-line sensitive or vertical-line sensitive.

With lenses whose maximum aperture is larger than f/5.6

The center AF point is a cross-type AF sensor. The other eight AF points are horizontal-line sensitive or vertical-line sensitive.

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