Upgrade from camera control if you have version 1 of nikon camera control you can buy this to upgrade to camera control pro 2 for a reduced price this software remotely controls most functions of nikon digital slrs from a computer that is connected via usb cable or through wired or wireless lan using a wireless transmitter advanced functions of the new nikon d3 and d300 such as viewer for preview and selection of images prior to transfer to a computer liveview function and picture control s