Technical Description (Opto-Mechanical); Eye-Controlled Autofocus - Canon EOS 55 Service Manual

Part 2: Technical Information
1. TECHNICAL DESCRIPTION
(OPTO-MECHANICAL)
1. 1 Eye-Controlled Autofocus
The EOS 50 / ELAN II features an improved version of the Eye-Controlled Autofocus
found in the EOS 5/A2E. The EOS 50 / ELAN II's Eye-Controlled Autofocus is faster,
more precise, and more feature-laden. The focusing point selection and depth-of-field
preview methods are basically the same as in the EOS 5 / A2E. Table 2-1 shows the dif-
ferences
in
features compared to the EOS 5/A2E.
Table 2-1 Comparison of Eye-Controlled Autofocus
(0:
Provided X: Not provided)
Item EOS55 EOS5
Horizontal compatibility 0 0
Vertical compatibility 0
X
Horizontal Calibration
0 0
Vertical Calibration 0
X
Calibration Settings 3 5
Eye-Controlled Servo AF 0
X
Eye-Controlled DEP 0
X
Response time
Approx. 120ms
Approx. 250ms
Sensor type Area BASIS CCD
Pixels 7000 6000
• Eye-Controlled Servo AF: When Eye-Controlled Autofocus and AI Servo AF are both
set and the shutter button is pressed halfway or continuous shooting is executed, AI
Servo AF (predictive AF) can track an approaching (or retreating) subject moving
across the three focusing points while the eye tracks the subject. This is made pos-
sible by the focusing point covering the subject and the autofocusing information
obtained from
it.
• Eye-Controlled Autofocus depth-of-field AE (See 1-3)
• As
with the EOS 5/ A2E, "self-learning" calibration is used. (Both horizontal and ver-
tical calibration data can be registered under the same calibration channel.)
Table 2-2 shows the compatibility of Eye-Controlled Autofocus with the exposure modes.
Table 2-2 Eye-Controlled Autofocus/ Exposure Modes Compatibility
Exposure Mode
p
TV
AV
M DEP
D
•
t&
&
~
Focus point selection
0 0 0 0 0 X 0 0 0 0
Depth-of-field preview 0 0 0 0
0 X X X X X
2-1
•..