From The TimeSplitters Wiki

Get down! -to work! Digital Camera has been given the Improvement Badge, Please contribute to this article!

You use the Digital Camera when you play NeoTokyo in TimeSplitters 2. After following the hacker to the base, make your way through to the room with the lockers running along the wall. Turn to face the opposite wall and take a picture of the blueprints. Exit this room. Walk out into the hallway to where you can see the TimeSplitter through the window and take the second picture.