During my time (74-79) an F95 camera was mounted above the vis bomb aiming window for Low level bomb scoring. The nav rad ran the camera approaching the target and the kit put a marker on the release frame. Once developed the wing weapons staff pored over the photos with a 50 thou map and identified the release point. Applying the release parameters recorded by the plotter allowed a forward throw to be calculated and thus an impact point and score. All very important for crew classification! I never got the hang of changing the cassettes though- leading to many void attacks in Goose Bay.