Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 83

< >: AF Start Button/Smart Controller On this control, you can press the center or drag with your finger. Pressing the < > button activates autofocusing. This is equivalent to pressing the shutter button halfway. You can move the AF point by dragging on the smart controller after pressing the < > button. You can also adjust the sensitivity-the amount the AF point moves in response to dragging ( ). [Direct AF point selection] can be assigned to this control by selecting [Smart controller] in [ 6: Custom Controls]. Assigning this function enables you to select an AF point directly by dragging on the smart controller during metering, without pressing the < > button, and then pressing the < > button to focus. Caution Precautions when using the smart controller In case of poor responsiveness if you are wearing gloves, use this control without wearing the gloves. The camera may not respond to touch operations with wet fingers. 83