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AF Technology
The EOS-1V's capacity
to capture moving subjects with the outstanding tracking performance and high focusing
speed of 45-point Area AF propels autofocusing into the new millennium.
45-point Area
AF is the result of Canon's pursuit of an AF system that allows continuous shooting
ease and expanded framing freedom. The 45 focusing points are densely packed within
an 8 x 15 mm zone and can be manually or automatically selected to meet the needs
of the situation. When multiple points are selected, AF system capabilities are significantly
extended. Born of Canon's original technology, this system has been refined for the
EOS-1V to ensure the unconditional reliability, accuracy and high focusing speeds
requisite for professional use.
While photographers have the freedom to frame images through the viewfinder as they
choose, the lens is automatically brought into focus as soon as the active focusing
points cover the subject. Like a human eye, Canon's 45-point Area AF tracks and aims
true. This is typical of Canon's state-of-the-art AF technology, recognized by professional
photographers everywhere.
A unique sensor design
vastly expands the range of lens/extender combinations with AF capability.
The Area AF system is comprised
of two kinds of sensor elements that are capable of remarkable focusing efficiency
because they are able to complement and compensate for each other. Each of the 45
focusing points within the Area AF is composed of horizontal line detection sensors.
These sensors operate with EF lenses having a maximum aperture of f/5.6 or larger.
They are particularly well-suited to focusing on moving subjects. The central seven
points of the Area AF sensor also incorporate vertical line detection sensors, six
of which operate with EF lenses with maximum apertures of f/2.8 or larger and theoretically
provide focusing precision three times as high as the vertical sensors. The design
of the Area AF sensor effectively creates seven cross-type central points capable
of unrivaled object recognition and exceptional accuracy. The central focusing point
is capable of cross-type focusing with EF lenses having a maximum aperture of f/4
or greater, or focusing with horizontal component detection with EF lens/extender
combinations having a maximum aperture as small as f/8.
The result is an Area AF sensor system ideally equipped for excellent performance
regardless of subject pattern; a system that brings out the true potential of Canon
EF lenses and lens/extender combinations.
Versatile composition with superb operability.
The 45 focusing points of the EOS-1V provide unique functionality and a new level
of focusing control. This system minimizes the problems of focus lock and recompose,
and brings an improved degree of fluidity to the creative process.
At its simplest level, all 45 focusing points can be used simultaneously for optimum
auto focus results. Focusing of this kind has the power to transform a simple snapshot
into a precisely balanced image. However, the true benefits of 45-point focusing
become more apparent when applied to more demanding situations.
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 :Selected focusing point
 :Focusing
points area extended by one step  :Focusing
points area extended by two step |
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It's easy to switch to a pre-selected focusing point simply by pressing the Assist Button.
When shooting conditions
fluctuate, or fleeting photo opportunities arise, even the most agile photographer
will be hard pressed to select just the right focusing point in time. Fortunately,
the EOS-1V allows users to register any focusing point as a home position (HP) that
can be restored from any focus setting, with a single press of the Assist Button*.
This extremely handy feature allows photographers to adapt quickly to almost any
situation.* The HP function is enabled by C.Fn-18.
At a rate of 9 fps, AI Servo AF delivers the fastest predictive focusing in the world*.
 *Assumes the use of the Power Drive Booster PB-E2 with the Ni-MH pack NP-E2. *Among 35mm AF SLR cameras with movable mirror as of February 2000. |
The predictive AI Servo AF system
allows the tracking of fast-moving objects while maintaining precise focus. This
system affords impressive results in terms of continuous shooting and boasts excellent
sequential processing efficiency. Sequential processing regulates an array of events within the exposure process, including the arithmetic processing of AE and AF, the driving of the lens, aperture control, and movement of the mirror and shutter curtains. In addition to developing new sequencing for the EOS-1V, every operation and its respective control time sequence has been reexamined in order to reduce operation time and realize parallel processing. A significant step in the technology of the EOS-1V is the newly adopted Active Mirror Control method, which reduces the operation time of the mirror to allow shooting at a rate of 9 fps. This device is fundamental to the stability of the AI Servo AF system. As for precision, the EOS-1V is capable of heightened focusing accuracy thanks to a newly developed predictive algorithm. The sequential efficiency, mechanical improvements and focusing accuracy of the AI Servo AF system are capable of functioning with a high level of synergy for incredible results. In fact, the EOS-1V can pursue, focus and continually shoot an approaching subject at speeds of up to 50 km/h (31mph) to a point 8 m (26 ft) ahead of the camera (assuming use of an EF 300 mm f/2.8L IS USM lens). |