In 1988 a new prototype system accessory for the F4 was shown by Nikon and was called the TV Remote Finder System
Presented at the Photokina 1986 this prototype and also Nikon's first SVC was built in collaboration with Panasonic.
This was one of the first fully digital cameras. Custom built by Nikon (F4 body) and NASA (electronics).
At the NEXPO 1993 in New Orleans, Nikon had an early prototype of the D1 on display.