The increasingly common gameplay mechanic that has the player taking pictures of enemies, items, NPCs, or features in the environment. This comes in two basic forms: as a sidequest, and as the whole point of a Hidden Object game.
In the sidequest form, either taking pictures allows you to collect or “capture” your subjects, or you receive a bonus when you take pictures of certain, usually well-hidden things. On platforms without a built-in hard disk, these sorts of games are infamous for either consuming absurd amounts of storage space, or having a painfully restrictive number of photo slots.
In the Hidden Object version, you identify the hidden objects by taking pictures of them. That's usually the whole game, although there may be minigames as well that use some other mechanic.
In both versions, if the photos are scored beyond "the subject is present in the frame", the AI often has some… unique ideas on what makes a good picture.
If the photography switches to a first-person view, then this overlaps with In-Universe Camera.
The entire premise of the old DOS/Mac Edutainment GameMidnight Rescue! was that by capturing photographic evidence you would be able to figure out the bad guy's disguise.
Myst IV: Revelation had a camera feature that could be used to not only capture puzzle solutions, but to also capture pictures of stuff that you thought was pretty. Taking lots of photos was also one way to variate and somewhat personalize an event that happened later on in the game.
Nancy Drew and the Warnings at Waverly Academy (2009) was such an offender with this trope. You have to, at one point, take photos of the students around the school, as well as the school itself. If you are one centimetre out of what the AI thinks is dead perfect, you have to try again. And again. And again. Not to mention that the characters taunt you if you take too long to line up the shot, and one of the students isn't even at the school, so you have to take a picture...of her picture. Gah!
The Legend of Zelda: Majora's Mask. In regards of the Swamp Tourism contest and the large man who co-runs it, you can earn rupees by snapping up photos of certain things with the Pictobox, and getting a photo of the Deku King (a rare sight) or Tingle (the son the guide was worried about) nets you a Piece of Heart. There's another event in the game triggered by taking a photo of one of the (female) pirates and giving it to the fisherman on Great Bay Coast. There's also the slightly creepy stalker Zora who wants a pic of Lulu, who'll pay you to snap a pic of her while she's grieving the loss of the eggs.
The Legend of Zelda: The Wind Waker. Just getting the picto box, as well as upgrading it for color features, spans a sidequest on its own: It all starts with exploring the narrow caves behind Tingle's prison, then showing the picto box to Lenzo, then completing three snap shot tasks, then finding a rainbow-colored firefly in Forest Haven and then giving it to Lenzo. After getting the color features, there's an elaborate Sidequest that involves taking pictures of nearly every character in the game (notably, one picture/statue can only be found if you have a Game Boy Advance and a cable to link it to your Nintendo GameCube, allowing you to complete another sidequest that spans five of the game's dungeons). Then there's the various sidequests in Windfall Island that involve giving pictures to certain characters. Also, in The Wind Waker HD, the Picto Box has the additional function of being able to post photos on Miiverse, even self-shots. This also helps to eliminate the risk of losing permanently figurines of characters or boss creatures who make limited appearances. The remake also allows the player to store four times as many pictures as before, which increases the pacing of the figurine collection.
Beyond Good & Evil was one of the first to use it as a major plot driver, as the main character was an underground reporter charged with digging up the truth about an alien conspiracy. In a variation, she's really a professional photographer. It was also a sidequest: Jade had been hired by a scientific foundation to assist in creating a library of photographs of every animal on the planet. Taking pictures of animals netted the player money and other bonuses.
This is in the demo of the game for Madagascar: Escape 2 Africa. Why do you needed to take good pictures of rhinos and elephants, just because you found a camera somewhere? Because.
The 3D doujin fighter Line Kill Spirits incorporates a somewhat unusual mechanic for fighting games: the only way to stop your opponent from regenerating after being damaged is to flip up her skirt and take a picture of her panties. This is pretty much the entire point of the game.
Super Smash Bros.. Melee had a Camera Mode that allowed players to take in-game photographs of their battles from various angles. And in case you wondering, yes you can do that, too.
Borderlands 2: Scooter asks you to take inspiring pictures for a love poem he's working on.
BioShock has you acquire and use a “Research Camera” as part of the plot. Using the camera to take photos of various enemies can grant you combat bonuses against them, and even power-ups! In the sequel's single-player mode, it's replaced by a video camera, which gives you more points for using a variety of attacks on the subject.
Naturally, since Bioshock is basically "System Shock 3" and its use is similar to the method for researching monsters and objects in System Shock 2, though that involved using chemicals found in storerooms.
Comes back in BioShock 2 multiplayer, although it's Nerfed considerably (it only allows you a small, circumstantial bonus against the person you snapped, no rewards for you)
There are a few Mario Party minigames that involve taking pictures of things, sometimes just to catch the most things in one photo. In particular, Mario Party DS has a minigame where the player's objective is to take a picture of all other players.
The WarioWare series has a few, including "Picture Perfect" in the original, and the "Shutter" minigame in Game & Wario.
Another old one, with a decent level of justification, the video game interpretation of Darkman had “Camera stages” where you ran through a basic Hogan's Alley taking shots of your next target. Darkman required photographs to craft his disguises in the film, although for some reason, the more pictures you took increased the amount of time he could stay in disguise, instead of just how good the mask looked.
Donkey Kong 64 had a camera that allowed you to "capture" banana fairies for inventory upgrades.
The Sly Cooper games, especially 2 and 3, have areas where Sly uses his all-purpose gadget to take some reconnaissance pictures, a natural thing for a thief to do before major operations. One mission uses the ghost-trapping idea, though. In PlayStation All-Stars Battle Royale, this is somehow Sly's Level 3 Super.
The PS3 and 360 versions of Sonic Unleashed include this. At night, you can travel the hub worlds and snap a picture of someone who isn't exactly the same temperment when you speak to them in the daytime. Doing so will cause you to enter a mini-level to defeat Dark Gaia's mooks within a time period in order to free the person from Dark Gaia's influence.
Way back in the early '90s Spider-Man vs. The Kingpin for the Sega Genesis asked you to take pictures of supervillains before you fought them. You could then sell them in your secret identity between missions to buy more web fluid. Justified, of course, because that's exactly what Peter Parker does in the comics.
Starting from GT4, Gran Turismo allows the player to take a picture of his car, during a saved replay, or in a fixed location. The player can even save these pictures to an USB thumb drive, transfer them to computer, and masturbate to the car-porn. Seriously, a Cadillac Cien in the right light...
Dark Cloud 2. You take pictures of objects in your surroundings, and then using combinations of those photos as inspiration, create new items. You can also snap pictures of Palm Brinks' inhabitants, who will mug for the camera in their own special pose. Getting particularly difficult snapshots, such as bosses or unique enemy attacks, would also net you points and rewards.
One of the characters of Shadow Hearts 2, Anastasia is armed with a camera which, in addition to providing expanded information on enemies you snap, also allows her to 'capture' certain enemies, copying their signature moves.
Speaking of, the sequel Shadow Hearts: From the New World also features this trope. Although this time, it's the protagonist spunky young detective who wields a camera. It also has an Enemy Scan effect, but he cannot copy attacks like Anastasia. The photos he takes are used in a trading sidequest.
One quest in World of Warcraft has the player take a newfangled gnomish image capture device called the "Super Snapper FX" and take a picture of a dangerous turtle. Unfortunately, the flash from the camera makes the turtle more than a little mad. When the picture is taken, an item is left in the player's inventory that shows an image of the turtle.
In Eternal Sonata, Beat's ability to take photos of monsters is the best way to make money throughout most of the game. That is, if you can learn the game's crazy standards for what constitutes as a good picture.
In Final Fantasy XI, an entire side game known as "Pankration" exists that requires "capturing" monsters in a camera like device to be later summoned for a Pokemon-like arena battle. The photos were later used to fund a new type of Bonus Boss fights, likely to drive some traffic towards Pankration as well.
Legend of Legaia has you visit a hot springs resort, where you can buy a Camera Stone from a vendor. It lets you take photographs in various places. If you win a Swimsuit for Noa by winning the dance contest in the Tower of Sol, she'll be wearing it in the pictures.
Anachronox, the Quake II-engine RPG, had this. The main character is a private detective, however, so it makes some sense. He doesn't do much detective work with it during the game, instead spending his time taking pictures of rare and fantastic things.
The World Ends with You plays with this a bit by Joshua, and later Neku using a cell-phone camera to take photos of the past.
Fallout: New Vegas has a quest where you have to take pictures of landmarks to give to Michael Angelo, an agoraphobic neon sign designer in need of inspiration.
Several James Bond games have objectives that require you to take pictures of secret weapons, devices, and such.
In the first Baten Kaitos, this is the only way to make money beyond the rare gimick magnus that can be sold (and you want to keep most of them for them to finish changing to register them instead of sell). The ammount the photos sell for depends on a number of factors, but the most common are distance (proceeding with a melee attack to get close is often to your benefit), lighting (Light and dark attacks before the camera will make the photo brighter or darker, and getting the balance right is key), and if the enemy blocks the photo (less money resulting). Thankfully, 2-4 "decent" photos (less if you don't keep boss photos as a Bragging Rights Reward or get some perfect shots) is all it takes clear out every shop of their (limited but slowly respawning) inventory.
The Touhou games Shoot the Bullet and Double Spoiler, sort of. The games are shmups, photography is your only option, and it acts like a Smart Bomb, clearing all the bullets that you photograph. Taking photos of bosses earns you points based on several factors, most importantly how many bullets are in the picture.
The Metal Gear Solid series. Taking pictures is required at least once in the series, and numerous Easter Eggs are available by snapping up photos of random innocuous things. Depending on what you snap you can find ghosts, have your CO call you a pervert, and confirm your best friend's doubts about your sexuality.
If you wait until the fourth Act to obtain the Camera in Metal Gear Solid 4, you'll find Otacon used it to take some photographs of Naomi.
In Spy Fiction you can disguise yourself as anyone you can photograph - either their outfit alone or their face depending on whether you can photograph them from the front or not. It makes the stealth sections remarkably easy.
Syphon Filter: The Omega Strain's third bonus mission has Mujari photographing evidence in a bombed-out Chechen village.
The whole premise of Fatal Frame (Project Zero in Japan) and its sequels is to take photographs of ghosts in order to seal them in your special camera. However, you also get bonuses for non-dangerous incidental ghosts.
Ghostbusters: The Video Game (2009) has the PKE Scanner, which you use to "scan" ghosts to get information on their fictional back stories, combat techniques, and which Proton Pack mode is best suited to breaking them down.
Warframe Update 11 added a "Codex Scanner" that can be used on enemies for xp as well as information on their health, weaknesses, strengths and items dropped.
Bully had quite a few missions and sidequests that involved taking pictures, which you could save if you wanted. The NPCs make direct mention of Jimmy having a camera.
The Endless Ocean games cast the main character as, among other things, a freelance photographer for diving magazines. Taking and selling pictures of various aquatic wildlife is an easy way to make money in the game. The second game tells you what (in theory) makes for a good picture by the game's standards
Frontier: Elite II has a class of military missions that involve taking pictures of an enemy installation on some uninhabited planet several light-years away.