Canon EOS-1D C EOS 1D X Instruction Manual - Page 67

2: Selecting the AF Mode One-Shot AF for Still Subjects Suited for still subjects. When you press the shutter button halfway, the camera will focus only once. AF point Focus confirmation light When focus is achieved, the AF point that achieved focus will be displayed, and the focus confirmation light in the viewfinder will also light up. With evaluative metering, the exposure setting will be set at the same time focus is achieved. While you hold down the shutter button halfway, the focus will be locked. You can then recompose the shot if desired. AF is also possible by pressing the button. If focus cannot be achieved, the focus confirmation light in the viewfinder will blink. If this occurs, the picture cannot be taken even if the shutter button is pressed completely. Recompose the picture and try to focus again. Or see "When Autofocus Fails" (p.110). If [z3: Beep] is set to [Disable], the beeper will not sound when focus is achieved. Focus Lock After achieving focus with One-Shot AF, you can lock the focus on a subject and recompose the shot. This is called "focus lock". This is convenient when you want to focus a subject not covered by the Area AF frame. 67