Remote Switch MC-30 Shutter Release for Nikon D3 D200 D300. Specially designed Nikon D3 Remote Switch adds greater convenience and ease in many shooting situations. Easily plug this Nikon D200 Remote Switch into your camera and turn your camera on. Release button of this Nikon D300 Remote Switch can be pressed half way and completely. Press it half way to activate the autofocus and set the shutter speed. Press it completely to shoot. For long exposure (camera should be set in Bulb Mode), press the button completely and slide in the direction of the arrow, which locks the button depressed, slide the button back to its original position. It is compatible with Nikon D3, D200, D300, D700.