How to use m mode on Nikon d3s

M mode is the manual mode. Generally, you first turn the operating mode button of the camera and lens to the MF position, then look at the scene to be photographed in the viewfinder, press the shutter halfway, and adjust the focus distance and zoom ring. (Image clarity), so that the scenery you see in the viewfinder is what you need, and the image is very clear, so that you can fully press the shutter.