Stanley Kubrick began as a teenage street photographer

Before he was a film director, Stanley Kubrick was a photographer. 

And he never lost his interest in photography. I remember Keith Hamshere, the first boy to play Oliver Twist in Oliver! and later a leading Hollywood stills photographer, saying he learnt to keep out of Kubrick's eyeline if he was on set during one of his films.

If he didn't, Kubrick would notice him and say something like "Is that a new lens? How are you finding it?", the film suddenly forgotten.