Canon EOS-1D C EOS 1D X Instruction Manual - Page 344

85: Custom Controls : AF point direct selection During metering, you can select an AF point directly with the dial or without pressing the button. With the dial, you can select a left or right AF point, or cycle through the zones if using Zone AF. *4: If you use and press the button in step 3 on page 337, you can press straight down to select [Switch to center AF point] or [Switch to registered AF point]. : Select AF point, O z S ( during metering) You can select the AF point directly with the dial without first pressing the button. While metering is active, turning the dial will select a horizontal AF point, or cycle through the zones if using Zone AF. The functions of the and buttons will be switched between them. By holding down the button and turning the dial, you can set the exposure compensation or aperture. : Metering start When you press the shutter button halfway, only exposure metering is performed. : AE lock When you press the button assigned to this function, you can lock the exposure (AE lock) during the metering. This is convenient when you want to focus and meter the shot separately or when you want to take multiple shots at the same exposure setting. : AE lock (while button pressed) The exposure will be locked (AE lock) while you press the shutter button. : AE lock (hold) When you press the button assigned to this function, you can lock the exposure (AE lock). The AE lock will be maintained until you press the button again. This is convenient when you want to focus and meter the shot separately or when you want to take multiple shots at the same exposure setting. If you assign [AE lock (while button pressed)] to the shutter button, any buttons assigned to [AE lock] or [AE lock (hold)] will also work as [AE lock (while button pressed)]. 344