The resolution of $x5 film, carefully exposed and processed created something of a conundrum in this scene. Down in the guts of the workshop there was a diesel generator that belched out a burst of fumes from its vertical exhaust so, decisions, decisions ..... do I get rid of the puff of carbon up between the crane jib and the left bridge tower? I have found similar with traffic starting off from traffic lights.
"Photography was not a bastard left by science on the doorstep of art, but a legitimate child of the Western pictorial tradition." —Robert Galassi