Canon EOS Rebel T5 18-55 IS II Kit Instruction Manual - Page 145

Using AF to Focus (AF Method) Notes for [FlexiZone - Single] and [uLive mode] AF Operation Focusing will take longer than with [Quick mode]. Even when focus has been achieved, pressing the shutter button halfway will focus again. You cannot focus a moving subject continuously. The image brightness may change during and after the AF operation. If the light source changes while the Live View image is displayed, the screen may flicker and focusing may be difficult. If this happens, exit Live View shooting and execute autofocus under the actual light source. When [FlexiZone - Single] is set and you press the button, the area covered by the AF point will be magnified. Press the shutter button halfway to focus while in the magnified view. This is effective when the camera is attached to a tripod and you need to attain very precise focus. If focusing is difficult in magnified view, return to the normal display and use AF. Note that the AF speed may differ between the normal and magnified views. If you magnify the view after focusing with [FlexiZone - Single] in the normal view, precise focus may not be achieved. If [uLive mode] is set, magnified view is not possible. 145