Green’s Dictionary of Slang

smudger n.

(UK und.) a photgrapher.

[UK]Thieves Slang ms list from District Police Training Centre, Ryton-on-Dunsmore, Warwicks 10: Smudgers: Street photographers.
[Scot]A. Parks February’s Son 159: ‘Gonnae have to get the smudger up here to take a few snaps’.