Canon RF 50mm F1.8 STM RF50mm F1.8 STM Instruction Manual - Page 8

2. Focusing/control ring The focusing/control ring can be used as either a focusing ring or a control ring. Focusing/control ring Focusing/control selector switch Use as a Focusing Ring Set the focusing/control selector switch to FOCUS. Set the focus mode (AF/MF) using the camera's menu. To shoot in autofocus (AF) mode, set the camera's focus mode to AF. To use only manual focusing (MF), set the camera's focus mode to MF, and focus by turning the focusing ring (focusing/control ring). zzThis lens does not have a focus mode switch. zzDelayed focus may occur if the focusing ring (focusing/control ring) is quickly turned. zzDo not touch the operating part in the front of the lens while the focus lens is operating. If external pressure is applied to the moving part, the lens initialization may be performed to return the focus lens to the correct position for control purposes. zzThe lens' focusing ring (focusing/control ring) is electronic. zzWhen AF operation is set to [ONE SHOT], manual focus is possible after autofocusing has been completed by continuing to press the shutter button halfway. (Full-time manual focus) However, the camera settings need to be changed. Please refer to the camera's instructions for details. ENG-7