The camera was donated by baconbomb, it's purpose is to allow you to play the role of a combat photographer. The clicking sound is just for kicks, it's really just to allow you to zoom way in, farther than a weapon will zoom, and take action shots using the game's F4 screenshot feature, without being right in the middle of the shooting trying to take shots (although that's pretty fun also!).
There is a specialist who has this as his primary kit. It's just a different way to have some fun in GR.
