The MC-4A unites older Nikon cameras with many various electrical devices that employ male or female type banana plugs. One side has the 3-pin connection found on some of the older Nikon cameras, e.g. F4s & N70 cameras, or the F3, FM-2 or FM-3A series cameras when equipped with their appropriate motor drives. Can also be used with newer 10-pin type cameras (F5, N90/F90, F100, D1 & D1X etc..) when used with the Nikon MC-25 adapter.