Specifications

III. NEW AND IMPROVED DESIGN FEATURES 11
mode
s, the optimum AF mode is set automatically. In the Creative Zone modes, one
c
an select any AF mode. In the Sports mode, AI Servo AF is set automatically.
AF points can be selected automatically by the camera or quickly and directly with the Multi-
controller. Press the AF point selection button and then move the Multi-controller in any of
eight directions or in at the center. Pressing the Multi-controller in the center will select the
center AF point. Moving the Multi-controller in the direction of the currently selected AF
point activates AF point selection and all the AF points will light. Similarly, if one presses the
Multi-controller twice in any direction, automatic AF point selection will be set.
An alternative AF point selection method is: press the AF point selection button and
then turn the Main Dial or the Quick Control Dial. If C. Fn-13 is enabled, one can skip
pressing the AF point selection button and just use the Multi-controller (C. Fn 13-1) or
the Quick Control Dial (C. Fn 13-2) to select the AF point directly.
In AI Servo AF with an EF 300mm f/2.8L IS
USM lens, Predictive AF can focus track a
subject approaching at a speed of 186
mph up to about 66 feet away. The 20D
uses statistical prediction, incorporating
the focusing data of past focusing opera-
tions. Because it can repeat more focusing
operations in a short length of time, the
Predictive AF control can operate effective-
ly
from the first shot, even for a subject
moving erratically. If the subject is not
moving, the AI Servo AF focus control is
very stable and will not permit the lens to
move, even minutely. If the subject moves
suddenly, the 20D will be ready to track
it immediately.
Autofocusing on the EOS 20D is speedy, thanks to the high-performance, 32-bit RISC
microcomputer and an improved AF sequence (AF processing front loading, SI illumination,
metering executed in parallel with the lens drive and mirror swing-up) to match.
Mult
i-controller operation
Mai
n Dial/Quick Control Dial operation
Automatic
AF point selection
Approaching
Subject
Speed
C
losest distance to the camera for continuous AI Servo AF
(w/ EF
300mm f/2.8L
IS
US
M)
31mph
186mph
66 ft.
38 ft.
26 f
t
.
62mph
*According to a test of all movable mirror type SLR cameras made by Canon (Feb.1, 2000).
Predictive AI Servo AF