Specifications

III. PERFORMANCE 10
T
he [Sensor cleaning] menu is basically the same as the one in the EOS-1D Mark III.
H
owever, there are slight differences such as the shutter operation sequence for [Clean
n
ow]. For the EOS-1D Mark III, it is: Cleaning operation -> Shutter cocking -> Cleaning
o
peration -> Shutter cocking -> Cleaning operation. In the EOS 40D, it is: Cleaning opera-
t
ion -> Shutter release -> Cleaning operation.
The option of manual sensor cleaning by raising the mirror and using a blower to
remove dust is the same as other EOS Digital SLR cameras.
A newly
-developed AF sensor with 9 cross- type AF points
greatly boosts AF performance, improving both AF detection
precision and extreme-defocus subject detection capability.
AF sensitivity is now EV -0.5 to EV 18. All AF points work as
cross-type points at f/5.6 or better. Both vertical- and hori-
zontal-line sensitive focus detection thus works with any AF point for stable focusing.
High-precision AF is attained with fewer AF failures with hard-to-focus subjects. Also, with
the sensor pitch reduced from 16µm to 14.4µm, detection performance is more accurate.
In sum, the newly-developed AF sensor has appreciably higher performance than the
EOS 30D's AF sensor.
AF
and New Autofocus
Sensor
AF Sensor
Fig. 43 Sensor configuration
Two-line sensors
in zigzag pattern
Cross-type sensor at f/2.8
Focusing sensors
for extreme defocus
Sensor Configuration AF Points AF Sensor Arrangement
S
ensor with F2.8 Support
Sensor with F5.6 Support
F
ig. 41 Unit construction diagram
L
ow-pass filter -2
C
MOS sensor
Low-pass filter -1
Sealing material
Support material
Piezoelectric
e
lement
P
haser layer
Infrared-absorption glass
P
hoto 9 Self Cleaning Sensor Unit
F
ig. 41 Unit construction diagram
Low-pass filter -2
CMOS sensor
Low-pass filter -1
S
ealing material
S
upport material
P
iezoelectric
e
lement
Phaser layer
I
nfrared-absorption glass
P
hoto 9 Self Cleaning Sensor Unit
Unit Construction Diagram
Self Cleaning Sensor Unit