That's a good question. To my knowledge, two DFN shots that I've heard of are the bedroom scene in Manunter (The night before he leaves to find the killer) and scenes of Oliver Reed in Gladiator (Since he died during filming, Scott reused existing footage to make the remaining scenes that he needed.) In these cases, there seemed to be a lot of deep blues, kinda like Terminator 2. Maybe that had a lot of DFN shots as well?