A piece of hardware can always be improved in this day and age with the release of better software, or firmware as some others prefer to call it. Nikon Corporation then is pleased as punch to announce that it is right now working on new firmware for its Nikon D4S , Nikon D810 , and Nikon D750 digital SLR cameras, where this particular new firmware will deliver support for recording command function with HDMI output to external recorders.