Sophisticated New Af System - Canon EOS EOS 5D White Paper

as the EOS-1D Mark II camera. Seen in its totality, this is groundbreaking performance:
top-of-the-mark image quality in a beautifully balanced package for thousands less than
ever before.
Sophisticated The EOS 5D camera has a new 9-point AF unit
New AF System with six Supplemental AF points, a new AF
algorithm and new AF circuitry. The new AF
system improves subject detection and focusing
precision at the center, the most frequently used
area, and significantly enhances subject tracking
performance. The nine AF points are concentrated
at the center, but the extreme left and right AF
points are located in the same positions as the
corresponding AF points on the EOS-1Ds Mark II.
In addition, the six Supplemental AF points,
grouped around the center of the image, provide
highly accurate focusing and do an especially
good job of tracking the subject in the AI SERVO
AF mode. These Supplemental AF points are not
visible in the finder and cannot be selected
manually, but they can be seen in the
ZoomBrowser or ImageBrowser software. They
are used during automatic AF point selection (AF
calculation speed and accuracy are as good as,
or better than, the EOS 20D's) and as AF area
expansion points when the center AF point is
selected in C.Fn-17-1, "Expanded AF point
activation area." They do not function in the
One-Shot AF mode.
The EOS 5D camera has three autofocus modes
plus manual focus (MF). In One-Shot AF, when
focus is achieved, the AF operation stops and
locks. Predictive AI SERVO AF tracks subject
movement and focuses continuously until the
start of exposure. AI Focus AF provides automatic switching from One-Shot AF to
Predictive AI Servo AF when subject motion is detected. The manual focus mode
provides a focus confirmation light, an illuminated superimposed AF point display
(enabled/disabled with C.Fn-10) and a beeper (enabled/disabled with the power
switch). AF-Assist is provided by EOS-dedicated Speedlites equipped with a near-
infrared (peak wavelength approx. 700nm) AF-Supplemental beam.
In AI SERVO AF mode and with automatic AF point selection set, a total of fifteen AF
points, including the six Supplemental AF points, will function automatically. As with
III. PERFORMANCE AND RELIABILITY
AF sensor positions
f/5.6-sensitive
major defocus
detection sensor
f/2.8 / f/5.6-sensitive sensor
f/5.6-sensitive sensor
AF sensor
: Sensitive to f/5.6 : Sensitive to f/2.8
Assist AF points Assist AF points
AF points and invisible AF points
Intermediate
AF points
8