Reference Guide

Main Sales Features ~;
Improved Autofocus
Focusing Modes
The new AF system incorporated
in the EOS-l
is faster. It works better
under low-light conditions, and it's
more precise.
There are three focusing modes:
1. One-shot mode
AF operation is completed and
locked once in-focus
is achieved. When
shooting in this mode, the shutter
will
not release until AF is completed. (This
feature can be overridden
by using
Custom Function No.4.) With evalu-
ative metering,
AF lock and AE lock
occur simultaneousl
y. Metering con-
tinues until just before the exposure
is made when using spot metering or
partial metering.
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2. Predictive AI servo mode
This sophisticated mode enables
focus prediction control for moving
subjects. The photographer initiates
the first shutter release in a motor-drive
sequence, subsequent exposures are
made after the lens
is adjusted to com-
pensate for the subject's movement.
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3. Manual mode
the AF system more flexible, since it is
possible to select independent opera-
tion.
AF is initiated by pressing the AE
lock button instead
of the shutter
button.
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Speed
The AF system on the EOS-l
focuses
even faster than the system
used on the EOS 630. This higher
speed enables AI servo shooting
at up
to
4.5 frames per second when using
the Power Drive Booster
El plus an
ultrasonic motor lens or one
of the
newly developed L series lenses.
4.5/sec.
High-precision
Focusing
Conventional AF systems can only
detect vertical lines. A newly-developed
cross-type BASIS solves this problem
by also being able to detect horizontal
lines. Use
of this cross-line system
greatly reduces the number
of difficult
subjects for
AF. It also results in much
more precise focusing, particularly
when using lenses with maximum
apertures
of f/2.8 or larger.
Improved Low-light
Performance
The AF system operates comfort-
ably
at low-light levels down to EV-l
(With lenses having maximum aper-
tures
of f 12.8 or larger and film speed
set at ISO
100). Having accurate AF
operation available even for low-light
conditions creates new possibilities
for sophisticated available-light
photography.
EV-1
Moving Subject
Predictive Control
The EOS-l's AF system is better at
tracking moving subjects. When using
ultrasonic motor lenses or the newly
developed L series lenses,
AF tracking
continues until just before exposure
begins. Depending on the speed
of the
moving subject, the camera automat-
ically activates the focus predict system.
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A switch on the lens barrel permits
the change from
AF to manual opera-
tion. The green LED indicator in the
viewfinder still lights up to indicate
that the subject
is in focus.
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The incorporation of Custom
Function Control technology makes
Ranged position
L. ______ ••••• ___ • • •••••• ______ •• ___ _ ____ _ _____ •
Predicted position
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