The Lightning camera was in the intake so, instead of seeing what the gunsight showed, you interpreted the film from where the pitot tube was. One Sqn boss had us looking at his film trying to figure out what he'd done wrong as the whole pitot tube/Canberra/banner picture was so wrong. Turned out he'd blown the approach and was attacking from outside the circle! Having had a ride on the Canberra jump seat getting shot at, you could hear the difference in angle off and I'm guessing that was a noisy sortie!