Canon 8090A004 EOS Rebel Ti manual - Page 55

AF Mode One-Shot AF When focus is achieved, the exposure setting is set simultaneously and the focus is locked. The shutter cannot be released until focus is achieved. AI Servo AF Ideal for moving subjects. The moving subject is focused continuously while the camera predicts the subject's point of focus for when the shutter is released. The exposure is set when the shutter is released. AI Focus AF When you press the shutter button, the AF mode (One-Shot AF or AI Servo AF) is set automatically depending on whether the subject is moving or not. AF Mode and Film Advance Mode Film Advance Mode One-Shot AF AI Servo AF Single frame The picture cannot be taken until focus is achieved. When focus is achieved, it also locks at the same time. The evaluative metering's exposure reading is also locked. (The exposure setting is retained until the picture is taken.) Autofocusing continues to match the subject's movement. The exposure setting is determined at the moment of exposure. Continuous The same conditions as above apply during continuous shooting (at about 2.5 frame per second). The same conditions above apply during continuous shooting. Autofocusing continues during continuous shooting (at about 2.3 frame per second). 55