Canon EOS DIGITAL REBEL XTI Service Manual page 29

7．Autofocus
7-1 Type:
7-2 AF points:
7-3 Focusing modes:
TTL-CT-SIR with CMOS sensor
9 AF points
⑴ The center AF point is sensitive to vertical and horizontal
lines as a cross-type sensor (① a sensor sensitive to vertical
lines to f/2.8, ② a two-line sensor sensitive to horizontal
lines to f/5.6, ③ a sensor sensitive to vertical lines to f/5.6)
⑵ The remaining 8 points are sensors sensitive to vertical or
horizontal lines to f/5.6.
Press the right cross key to display [AF mode].
・ The name of the selected AF mode is displayed in the camera
setting display on the LCD monitor.
1)Autofocus
In the Creative Zone modes, the following three modes can
be selected:
[One-Shot AF]
When focus is achieved, the AF operation stops and locks (AF
lock).
⑴ AF-priority (The shutter can be released only when focus
is achieved.)
⑵ During evaluative metering, AE lock is set when focus is
achieved.
⑶ In metering modes other than evaluative metering,
exposure metering continues in real-time until the shutter
is released.
⑷ With applicable USM lenses, electronic ring manual
focusing can be used after focus is achieved with One-Shot
AF or if focus cannot be achieved with One-Shot AF.
⑸ Automatically set in the Portrait, Landscape, Close-up, and
Night Portrait modes.
[Predictive AI Servo AF]
Tracks subject movement and focuses continuously until the
start of exposure.
⑴1st shot during SW-1 ON
・ Creative Zone modes: Shutter-release priority (shutter
releases after the lens drive stops during focusing).
・ Sports, Full Auto, No Flash modes (AI Servo AF): AF
priority
⑵ 2nd shot onward during continuous shooting: Shutter
releases after the lens drive stops during subject tracking.
⑶ Set automatically in the Sports mode, beeper sounds. No
focus confirmation light.
⑷ Creative Zone modes: No beeper, no focus confirmation
light.
⑸ If focusing is impossible, the focus confirmation icon
blinks.
⑹ The USM lens' electronic manual focusing will work if the
camera cannot autofocus the subject.
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General Information