What is A and M on Nikon Lens?
A stands for auto-focus and it is the tendency of your lens to focus on the subject automatically. M stands for manual focus, and is used when the user of the camera focuses on the subject while rotating the dial. The switch is named as M/A or M. In the M/A mode, the camera makes an effort to auto-focus on the subject as long as the camera itself is set to the auto-focus mode.