Canon EOS Rebel T1i Brochure - Page 3

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EOS SLR TECHNOLOGY

The history of Canon EOS SLR cameras is brimming with examples of technological

innovations that have set new industry standards for performance and usability. And

yet, at Canon, technology is never an end in itself. Every technological advance must

yield tangible benefits to the user. Does a new feature enable the camera to more quickly

and faithfully respond to the photographer's will? Does a new material or process

improve the camera's long-term reliability? Canon EOS advancements endure because

they enhance the photographic experience, whether you

are a seasoned professional or new to SLR shooting.

Put simply, Canon EOS SLR technologies are

impressive because of the quality of the images

they enable you to create.

©Simon Bruty

The best autofocus system is comprised of the

ultimate combination of accuracy and speed. And

for that combination, there's nothing like the AF

systems found in EOS SLRs. With cutting edge

technical innovations, EOS cameras always feature

the latest in AF performance, raising the bar with

each successive camera introduction. Top EOS

SLR cameras use an extraordinary 45-point

high-density Area AF system that provides a

large AF coverage area, but also the greatest

range of control over focusing point selec-

tion. The focusing point can be selected

automatically by the camera (based on

high-speed microcomputer analysis of

image content) or manually by the user.

Select EOS cameras feature up to 39 cross-

type AF points that provide both vertical

and horizontal sensitivity, guaranteeing the

same optimal performance no matter the

camera's orientation. To maintain focus,

advanced Canon focus tracking technology

helps to retain the accuracy of the initial AF

setting, no matter how fast the subject is

moving. High-speed microcomputers use

advanced algorithms that ensure fast and

accurate AF performance under a wide variety of

AF Technology — The EOS 7D features an all cross-type

19-point AF system with AI Servo II AF that precisely tracks

conditions. Focus tracking modes include single

subject movement for sharp, accurate focus almost every time.

point AF, Spot AF (which narrows the area used by

the AF line sensor, helping to reduce detection

it is off-center. AI SERVO AF/AI SERVO II AF mode is

errors that occur from near and far objects when

excellent for moving subjects. Aided by a highly

aiming at small subjects), and AF point expansion,

intelligent predictive focusing algorithm, it precisely

where AF points surrounding the one chosen can

tracks subject movement across the wide AF

assist when the subject becomes unfocused.

coverage area, automatically shifting the active

Canon's AF systems also detect the type of light

focusing point vertically and horizontally as

source and automatically compensates the focus

required. AI FOCUS AF mode, in which the camera

by taking into account artificial lighting sources

automatically decides between ONE- SHOT and AI

and making appropriate adjustments.

SERVO AF modes based on subject movement, is

ideal for shooting unpredictable subjects. The new

AI SERVO II AF, found on the EOS-1D Mark IV and

Canon EOS cameras feature a number of dedicated

EOS 7D, uses new algorithms for even better pre-

autofocus modes designed to enhance reliability

dictive focus tracking performance when shooting

in specific shooting situations. ONE-SHOT AF

subjects with unpredictable movement. Even diffi-

mode is ideal for static subjects — the camera

cult, high-magnification subjects, such as a flower

rapidly selects the optimum focusing point, and

in a breeze are captured accurately with a Canon

the subject is instantly brought into focus even if

Macro lens using these new tracking algorithms.

10 fps — This highly responsive AF technology contributes to

the rapid continuous shooting capability of EOS SLR cameras

—a maximum of 10 fps (frames per second) with the EOS-1D

Mark IV & EOS-1v equipped with Power Drive Booster.

EOS SLR CAMERAS

EOS SLR cameras have always been

associated with speedy operation.

Certain Canon EOS cameras offer 10

frames-per-second continuous shooting,

up to 28 RAW files or 121 full-resolution

JPEGs. Canon provides other aspects of

camera responsiveness as well: the

speediest EOS has a minimum lag time of

40msec, an 80msec viewfinder blackout

time (at speeds of 1/60th and above),

shutter speeds up to 1/8000 sec., and a

flash sync as fast as 1/300 sec. when

used with EOS Speedlites. Dedicated,

quiet low-speed modes and self-timers

add flexibility to speed.

Beyond the AF modes supported in each EOS

camera, Canon developed a number of AF options

to further enhance customization and creativity.

Certain Canon models can register original AF

points' "Home Positions" and represent them in

both horizontal and vertical shooting positions,

suitable for shooting in situations where compo-

sitions are retained from shot to shot. For more

flexibility, the new Canon Zone AF system is

particularly useful when the subject is off-center.

One of five distinct focus zones can be chosen

and the optimal point can be selected from

there. In addition to these modes, certain EOS

cameras' AF systems can be further customized

via the Custom Function Menu. Parameters such

as initial focus point, AF beam control, AF zone

expansion, AF Stop and more can be selected and

refined to suit the photographer and the situation.