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Canon EOS Digital Rebel XT Digital SLR

Canon EOS Digital Rebel XT 7-Point Wide-Area AF System

Fast, precise AF makes shooting fun and spontaneous. The 7-point Wide-Area AF System makes focus quick and accurate, even when your subject is off center. 7 focusing points are laid out in a cross pattern that's visible on the clear, uncluttered Viewfinder. You can let the camera detect your subject and choose the proper focusing point; the chosen point will be illuminated for no-surprise focus. The Digital Rebel supports your own creative vision as well by letting you choose your own focusing point. Dioptric Adjustment lets you shoot comfortably with or without your glasses.

With the addition of the DIGIC II and some fine-tuning, the AF system of the EOS Digital Rebel camera has been adapted to the Rebel XT camera and is fully compatible with the handling speed of the new camera. The EOS Digital Rebel XT camera uses the same 7-point, TTL-CT-SIR (TTL Cross Type secondary image registration) AF sensor as the EOS Digital Rebel camera, as well as the same 32-bit RISC (reduced instruction set) microcomputer. The AF speed and predictive AF performance are faster than or equal to the Digital Rebel. With an EF 300mm f/2.8L IS USM lens, it can focus track a subject approaching at 186 mph up to about 66 feet away. The brightness range required for focusing is EV 0.5 to 18.

In the Creative Zone modes, the user can now select the AF mode: One-Shot AF (When focus is achieved, the AF operation stops and focus is locked), Predictive AI Servo AF (tracks movement and focuses continuously until the start of the exposure), or AI Focus AF (automatic selection of One-Shot AF or Predictive AI Servo AF based on analysis of subject movement).

As with the EOS Digital Rebel camera, the EOS Digital Rebel XT camera's predictive AF computation uses statistical prediction that samples the focusing data at a very rapid rate. If focusing operations are repeated in a short period of time, the predictive AF control can operate more effectively from the first shot, even for a subject moving erratically. Additionally, even if the subject's movement changes just before the shutter is released, the predictive AF control will have a good chance of catching it.

The AF point can be selected manually with the cross keys on the back of the camera, or with the electronic dial. The user can avoid pressing the AF point selection button before using the cross keys to select an AF point by activating Custom Function 1-4. The AF point selection operation with the cross keys is similar to the EOS ELAN 7N. With the electronic dial, AF point selection is the same as with the EOS Digital Rebel camera.

To enable manual focusing with the focusing ring, the lens focus mode is switched to M or MF (with Canon EF and EF-S lenses). When focus is achieved, the focus confirmation icon and superimposed display light up.

The AF-assist beam is a series of stroboscopic flashes from the builtin flash or a near-IR patterned LED with a compatible accessory Canon Speedlite. With the built-in flash, the working range of the AF-assist beam is approximately 4 meters/13.2 feet at the center and 3.5 meters/11.5 feet a the other 6 AF points. Firing stops when the focus detection confirmation signal is detected.

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