The beauty of the Nikon flash system is that you don't need to worry about it, it usually just works great for film cameras.
Buy any flash (Speedlight) made in the last 15 years with a TTL setting and it will work perfectly with any modern or old film camera. The only real difference between flashes is how far away you can get and still have enough light. Honest, all the other features are meaningless for practical photography.
