Precise 9-Point Af Systems - Canon EOS 5D Mark 2 Tutorials Manual

IV. PERFORMANCE AND RELIABILITY

Precise 9-point AF Systems

some cases, the largest face found in the scene and the camera focuses on that face
(metering and color balance is also optimized to produce a more accurate facial tone
based on the face in the box). The multi-controller then allows you to move the box to
another face as desired, after which the AF and metering system will reset for that face.
E-TTL Flash photography is possible in normal Live View mode, but not when the Silent shutter
mode is activated. Otherwise, when the shutter is pressed to capture the image when using the
flash, the LCD blacks out as the mirror flips down and pre-flash exposure data is registered in
the camera prior to exposure. The time delay is similar in length to that caused by pressing the
AF Button in Live View mode. Flash photography is also supported when the EOS 5D Mark II
is set to Live View Function, but it is disabled in HD video recording mode.
The AF systems on both the EOS 50D and EOS 5D Mark II are very similar to the systems
on the models they replace, with the same improvements appearing in both new cameras.
Among these are faster AF data processing made possible by the DIGIC 4 Image Processor,
improved AF precision, and AF Microadjustment for individual lenses.
The EOS 50D features 9 cross-type AF points arranged in a diamond pattern, with all
sensitive to both horizontal and vertical details when using f/5.6 or brighter EF and EF-S
lenses. This sensitivity achieves faster, more precise focusing with hard-to-focus subjects,
and enables high-speed (6.3fps) continuous shooting in the AI SERVO AF mode while
tracking a subject.
EOS 50D AF Systems
Sensor Configuration
Cross-type sensor at f/2.8
Focusing sensor for Two-line sensors
extreme defocus in zigzag pattern
When using an f/2.8 or brighter maximum aperture lens, the central AF point offers enhanced
cross-type sensitivity and faster detection of subjects in extreme defocus. This is achieved by
adding diagonal sensors and a 2-line, zigzag configuration to the existing f/5.6 sensor already
positioned in the center of the diamond.
AF Points
31
AF Sensor Arrangement
Sensor with f/2.8 Support
Sensor with f/5.6 Support