Canon EOS-1D C EOS 1D X Instruction Manual - Page 345

85: Custom Controls : FE lock During flash photography, pressing the button assigned to this function will fire a preflash and record the required flash output (FE lock). : Set ISO speed You can press to change the ISO speed. Set while looking at the top LCD panel, viewfinder, or LCD monitor. : Set ISO speed (hold button, turn ) You can set the ISO speed by holding down and turning the dial. If Auto ISO is set, manual ISO speed setting will take effect. Auto ISO cannot be set. If you use this function in the mode, you can adjust the exposure with the ISO speed while maintaining the current shutter speed and aperture. : Set ISO speed ( during metering) During metering, you can set the ISO speed by turning the dial. If Auto ISO is set, manual ISO speed setting will take effect. Auto ISO cannot be set. If you use this function in the mode, you can adjust the exposure with the ISO speed while maintaining the current shutter speed and aperture. : Set ISO speed, O z g ( during metering) During metering, you can set the ISO speed by turning the dial. The functions of the and buttons will be switched between them. By pressing the button and turning the dial, you can set the exposure compensation or aperture. 345