Steven Hopper from GameZone writes,
"The first game introduced a camera mechanic, which allowed you to research enemy types by taking their picture. This would give you specific attack boosts against them when you take them on. Bioshock 2 takes this even further by giving you the ability to film your enemies as you attack them, employing a trial-and-error style of research. After activating the camera that you find in Pauper's Drop, you'll throw everything you've got at an enemy, and as you use different weapons and ammo type as well as different plasmids, you'll earn attack boosts against them and even unlock special moves that can be used later on. "