Part
2:
Technical Information
1.2
AF
System
The
camera
uses
the
same
multi-BASIS (cross-type
sensor
at
center
flanked
by
vertical
line-sensitive
sensors)
found
in
the
EOS
500/Rebel
X.
Its
three
focusing
points
give a
wide focusing
area.
The
focusing
point
can
be
eye-selected (horizontally
or
vertically),
dial-selected,
or
camera-selected.
There
are
four
focusing modes:
One-Shot
AF,
AI
Focus
mode
(switches
automatically
between
One-Shot
and
AI
Servo AF),
AI
Servo AF,
and
manual.
The
AF
mode
is
set
direct-
ly
with
the
AF
mode
dial
on
the
right
shoulder
of
the
camera.
The
AI
Focus
mode,
which
could
be
set
automatically
only
in
the
Full
Auto
mode
with
the
EOS
5/
A2E,
can
be
set
with
any
Creative Zone
mode
in
this
model.
Table
2-5
compares
AF
performance
of
the
EOS
5/
A2E
and
EOS
55 / 50 /
ELAN
II
E.
Table 2-5 Comparison
of
AF performance
(0:
Provided
X:
Not provided)
Item
EOS
55/
50/
ELAN
II
E
EOS5
Focusing points
3 5
AF sensor type
I+
I
11+
11
Eye-Controlled
Horizontal
0
X
Focusing
Autofocus
Vertical
0
0
point
Camera-selected 0
0
selection
Manually-selected 0
0
Focusing speed
Identical to EOS 5
Precision
Identical to EOS 5
Low light limit
0EV
0EV
Predictive
Eye-Controlled Autofocus Eye-Controlled Servo AF Eye-selected focus point
AF control
Camera-selected Center focus point selected shiftable to other points
Manually-selected
Selected focusing point
Focus point compatibility
3
5
Built-in Effective
Center 6.5m 7m
AF llluminator range
Off-center
4m
3.5m
Coverage
Covers 28mm to 135mm lenses.
• Built-in AF-Illuminator:
When
the
camera
is
used
with
the
540EZ
(which
is
equipped
with
a focusing
point-linked
AF-Illuminator),
the
540EZ
emits
the
AF-Illuminator
auto-
matically
when
required.
When
the
camera
is
used
with
other
EZ-series
Speedlites
or
with
the
160E,
the
camera
emits
the
AF-Illuminator
automatically
when
required.
The
Speedlite
automatically
emits
the
AF-Illuminator
only
if
the
center
focusing
point
has
been
manually
selected
with
the
Main Dial.
2-5
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