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Cocky Olly

Cocky Olly

Category:Children's gamesCocky Olly is a children’s game similar in style to forty forty. Like forty forty, and unlike other tag games, players in cocky olly are caught when their name is said, rather than by physical contact. The game begins by selecting a player to be “it” and choosing a landmark (such as car/tree/lamppost) or area to be the base. The player on “it” stays at base counting, whilst the non-“it” players run off and hide. The “it” player then seeks out the hidden players, and, upon finding them, shouts “cocky olly I see [name]” (or “cocky olly [name]” for short). The player whose name is said is now caught and returns to base. When the “it” has caught all non-“it” players, the game is over. However, non-“it” players may rescue caught player from base. This is done by contact and caught players must remain in (or in contact with) the base, before they are saved. Caught players may guide their would-be rescuers to base by shouting out the position of the “it” player. When the “it” player is far from the base in one direction, it is safe for rescuers to approach from the other.

Category:Children's games

This category is for games played informally by children. See also:
- Playground game
- Party games category Category:Games Category:Childhood Games

Forty forty

Category:Children's gamesForty forty is a children's game in the style of the popular game "it". Like "it", there is one player that is "on" or "it", who must capture the other players. However unlike "it", no physical contact is required. In order to catch someone, the "it" must see the person and say "forty forty I see [name]". The game begins with deciding what player is "it" and what landmark (tree/bench/lampost) is base. Once decided, the players who are not "it" run away and hide, whilst the "it" counts to a certain number (40 or 100). The "it" looks for the other players, whilst they try and get to base without being seen. If a player gets to base without being seen, he/she shouts "forty forty home" and is then safe. He/she then waits at base for the remainder of the game. Players that are caught by the "it" return to base, but are not safe. The last person to be caught by the end of the game is the "it" for the next game. This encourages non-"it" players to head for base as soon as possible, so that they are not the last caught player. Variant rules include the being able to "save" caught players at the base, thus making them safe from being "it" next round. Some variants include the possibility of "save all", in both cases, the player making the save shouts "forty forty I save [name]" when they reach the base.

Tag

:This article is about the game "tag". For other uses of this word, see Tag (disambiguation). Also see the use of the initials TAG. Tag (also known as it, had, he, tig, or other names) is an informal sport or game (see also playground games) that usually involves one or more players attempting to "tag" other players by touching them with their hands. Played throughout the world and since ancient Egypt, if not earlier, tag is inherently simple -– most forms require neither teams, nor scores, nor sports equipment such as balls -- but it may be made more complex with various rule modifications. Both of these aspects make tag a popular game amongst children, and it is often played in informal areas such as playgrounds or back yards.

Basic rules

After "it" is chosen, the other players scatter. "It" must chase them down and tag them. A tagged player becomes "it", and the former "it" joins the others in trying to avoid being tagged. This process repeats. In a typical game of tag, no score is kept, nor is a winner selected. Those who can avoid being tagged or who can stay "it" for the least amount of time are generally regarded as the best players. There is no time limit; the end of the game is chosen arbitrarily, perhaps when the players tire of the game, when recess ends or when players get called home for dinner. An anomalous property of tag is that although being "it" gives a player the most influence upon the game and thus could be considered the best role to play, the position is stigmatized and avoided. While most agree that the temporary stigma associated with being "it" is harmless, some have criticized tag because, they allege, a player who is often pursued to be made "it" or who is physically slow can be singled out and embarrassed. Because of this, tag and dodgeball were banned from New Jersey schools on November 18, 2002. In the UK, the same game is often simply known as "it", "tig" or, in the Midlands, "dobby". In some parts of Australia it is called "tiggy", "chasey", or "tips". In Pittsburgh it is often called "catchers". In Japan, the game is known as "Onigokko," and the person who is "it" is called "Oni." In Bavaria it is called "Fangermandl" (i.e. "catch the man"). In Ireland it is called "chasing" and the person who is chasing is said to be "on". In Poland it is called "berek" and it is also how the chasing person is called. In Brazil, it is called "pega pega" ("catch catch"), and "it" is referred to as "having it", as in: "John has it". In Finland, it is called "hippa".

Variants

There are many variants on the basic game of tag. The following list should by no means be viewed as complete or authoritative. These are just some of the most popular forms of the game. The names given to different games vary with time and place so the titles should not be seen as the most common or most definitive names for each type of game, but merely serve as examples.

Borders and bases

In order to keep the action fast and fun, a game of tag often has arbitrary borders that the players cannot step beyond (e.g., a fenced-in back yard, a school yard or the end of a street). This prevents players from running far beyond the area where the game started to avoid being tagged. A game of tag may also have one or more "bases", usually a landmark such as a school yard bench, tree trunk or patch of dirt. When a base is touched or stood upon, it grants a player invulnerability from being tagged. It is usually considered cowardly to spend so much time on the base that becoming tagged is impossible, so prideful players usually resort to the safe haven of "base" only in emergencies. "Base" is sometimes called "Tee," "Bali," "Goo", "Ghouls," or "Goal." Sometimes, players are considered safe if they simply grab the hands of someone who is at a base. This is known as "electricity", as the safety of the player at the base is transferred to the other person.

Budge

As above a number of bases are used for safety but only one player may inhabit each base. When another player runs to an occupied base they shout "Budge!" and the first player must leave their sanctuary. It allows for tactical play by those who are not it in ejecting other players into maximum danger.

No Tag Backs

"No Tag Backs" (also "can't get the butcher back", "no catch backs" or "no tap backs") is a phrase that can be used in most tag variants. If the person who is "It" tags another player, and then the player tries to tag the person back, the former "It" player says "No Tag Backs". This means that the person who is "It" can't tag the person who made them "It". This rule was created to allow the former "It" player not only a chance to get out of close proximity of the current "It" player, but to give them a few moments of immunity to catch their breath.

Freeze tag

Freeze tag varies from normal tag in that once a player is tagged, he does not become "it"; rather, he is "frozen" and must stand in place without moving while "it" continues to tag and "freeze" the other players. Whoever is the last to be tagged is the winner. Freeze tag often includes some mechanism for freeing frozen players and thus forcing "it" to re-tag them. For example, if two frozen players can extend their arms far enough to touch each other (without moving their feet), they may shout "electricity!" and become un-frozen. In another variant, sometimes known as "stick in the mud", "Chinese freeze tag" or "Scarecrow Chasey", players may be un-frozen when someone crawls between their legs. Such an action helps prevent "it" from winning, but puts the person crawling in a position where he can be easily tagged and frozen as well. "Scarecrow Tig" frozen players can also be unfrozen by a player running under either of the arms in variants of the game. A continuous version of freeze tag goes something like this: A player that is frozen may be unfrozen if tagged by a player who is not "it." A player that has been tagged/frozen by "it" becomes the new "it," and all freeze-counts are reset. This variation is called "Koori Oni" in Japan.

Blob tag

Blob tag (or amoeba tag) varies from normal tag in that players who are tagged by "it" must join hands or arms and work together to tag further players who must also join the chain. The "blob" of "it" players continues to grow until the final player has been tagged. Blob tag is popular with elementary school physical education teachers as it works well with large groups of children and emphasizes teamwork. A variant known as Tigs-Out where tigged players must go and hold onto a base, each player tigged next will hold onto the player holding the base. holding the next player and so on and so on, until a chain of players with 1 player holding the base. In order to free all players holding the base the free players must tig the base and shout Tigs-Out! Providing this is a fair tig to the base and is seen by the chaser and heard as well then everyone apart from the person who is "on" (a tigger) then the game continues as all who were previously caught are now free. The game can be won by the tigger if they catch everyone. This game gets harder, the more people who play. If a tigger can catch more than 10 people they are considered an excellent player. Tigs-Out was invented in 1982 in Coventry by Raymond Daley, played at Ernesford Grange School & Community College.

Bulldog (aka British Bulldog)

:Main article: British Bulldog Bulldog is not usually considered a form of tag, but the game is similar enough to be included here. Bulldog is played across a broadly rectangular area, with a physical or imaginary line across the area near each end. The catching player cannot cross this line, and cannot catch any player who is across it, even if he can physically reach them. The catching player gets his chance to catch the others when they attempt to run from one end zone to another. Using the idea of "safety in numbers", when one player runs the others will generally follow. Such mass runs generally happen often - the game would be rather boring otherwise. If, however, the catcher feels that the runners have waited too long in the end zone, he can call "bulldog" to force them to run. In most versions of the game, those who are caught become catchers themselves, alongside the existing ones. Thus, the game ends with one (presumably skilled) runner facing a horde of catchers, and eventually being caught. Usually, a catch is achieved by simply touching a player. However, versions exist where, to be caught, a runner must be immobilised on the ground, or (in parts of the UK, at least) lifted off of the ground.

Marco Polo

:Main article: Marco Polo In this variant, named for the 13th-century traveler, "it" is either blindfolded or made to keep his eyes shut firmly. The game then progresses as per normal tag, but "it" may shout out "Marco!" at any time. The other players must then reply "Polo!", thus giving the blinded "it" an audial clue to their locations. Marco Polo is most often played in swimming pools due to their small size and the difficulty of trying to escape "it" without making noise. If "it" suspects that someone has exited the pool, they can shout "fish out of water," and whoever has been out of the pool the longest becomes the new "it."

No Babysitting (No Puppy Guarding, No Monkey Guarding)

This can be in most tag variants. If a player is on their "base" (a.k.a. "Bali") and the person who is "It" waits for them to come out, and there is a time limit on how long a player can stay on a base, the player who is on the base says "No babysitting" meaning the person who is "It" can't trap the player on the base to run out of the time allowed to be on the base. If "No babysitting" is said, the person who is "It" must go somewhere else until the player on the base goes off the base. In England this is called 'Doggy Watching'. If 'It' is continuously waiting for players to exit the 'base', children sing the words 'Dooooggy watcher, Doggy watcher, doggy watcher' in an attempt to make 'It' become tiresome of waiting and therefore go elsewhere and allowing trapped players to exit the base.

Hide and seek

:Main article: Hide and seek Hide and seek (sometimes also called hide and go seek) is a popular tag variant that is best played in areas with lots of potential hiding spots, such as a forest or a large house. "It" covers their eyes or uses some other method to avoid seeing the other players while they count out loud. They then try to find the hiding players. The next "it" is either the first or the last player found, depending on the rules agreed to by the players. A seasonal variation of this is a game played during Autumn and Winter called "Zombie!". This is normally played after dark or during late evening. A player will be elected to be the Zombie who is the finder. The zombie will pretend to be mad/insane and try and find the hiders as quietly as possible. The object of the game is to scare the hiders by getting as close to them as possible then jumping out on them and shouting "Zombie!" and frighten them as much as possible. If you make the hiders scream and bolt from the hiding place they are considered caught. If the Zombie can actually physically catch the hider without being seen this is considered a perfect catch! The person caught will then become part of the Zombie's Army. There is also reverse Zombie where the Zombie hides and must try and catch each of the seekers as they try and find him/her indivually by shouting "Zombie!", once caught they become Zombies as well. This is ideally played near Halloween, and the more bizarre and scary the Zombies behaviour, the better.

Dub-dub-in

This variant is a cross between hide and seek and cops and robbers. As in hide and seek, the game starts with "it" closing their eyes and counting out loud (typically to a large number, such as 100) while the other players find places to hide. Like cops and robbers, this game includes a base - ideally a pillar of some sort, like a lamp-post, a drainpipe or a tree. "It" has to seek out the other players, and upon finding them must touch the base and call "dub-dub-out!" followed by the player's name, while pointing out their location. Those who have hidden themselves have to touch the base and shout "dub-dub-in!". They are then "safe" and play no further part in the game, although they may move about freely (provided they do not get in the way of the other players, or reveal the locations of those still hiding). In some variations the players can shout "...save all!" to save the players who have been spotted at that point. This heightens the tension as it is possible for the last hiding player to save all the others and put the seeking player back in for another turn. The game ends when all players are either "out" or "safe", and the next person to be "it" is chosen according to the rules agreed by the players. There are many variations on the 'magic' words used to find and to save in this game, e.g. "rin tin tin all free", "forty five and in", "forty forty..." (Oxfordshire,England. 1960s and 1970s); "tinkinalurkie..." (Derbyshire,England, 2000s); "tin pan alley" (~ I see or ~ Home!) (Hertfordshire. England, 1970s). Some variations have changes in terminology which permeate the whole game, as in "forty-four save all" (attested in Sussex, England), where the catcher counts to forty-four, and the calls in the game are "forty-four see you", "forty-four in", etc.

Kabuki

This variant (named for the Japanese theatrical tradition) is played in darkness, but is otherwise similar to hide and seek. Being "it" is harder due to the low visibility. The "it" player can shout out "Kabuki!", however, thus forcing the hiding players to reply with the same and therefore give a clue as to their whereabouts.

Smear the queer

Smear the queer (also called smear) is a rougher tag variant more common among older children and teenagers. In this game, "it" is instead called "the queer" (the word is used in the Victorian sense of "strange person" rather than the modern definition of "homosexual", though contemporary players may interpret it in the latter sense). The queer does not try to tag the other players; instead, he tries to avoid being tagged, or, more often, tackled (knocked down to the ground) or attacked with a toy weapon. Smear the queer is often played with an object such as a ball which is held by the "queer". Once the "queer" is tagged or tackled, he throws the object into the air. The other players then try to grab the object, thus becoming the new "queer". Unlike other forms of tag, those who stay "it" the longest are considered the best players. It is also sometimes called "Kill the Carrier", "Kill the guy with the ball", "Kill the dill with the pill", "Keep off" or "Cream the Carrier". In GoldenEye 007, a video game for the Nintendo 64 console, it was called "The Living Daylights [Flag Tag]". The Japanese variant "Shippo-tori" is somewhat similar to smear the queer. In this variant, every player carries an object, usually a handkerchief, and is considered "it." A player is eliminated from the game when another player still in the game takes his object; the winner is the last player to retain his.

Ghost in the graveyard

This variant is played outdoors after dark. The "it" player is known as the "ghost in the graveyard" and runs away from the group to hide. The other players start at a location chosen to be "base", close their eyes, and count aloud to 12 in this fashion: "One o' clock, two o' clock, three o' clock ghost! Four o' clock, five o' clock, six o' clock ghost! Seven o' clock, eight o' clock, nine o' clock ghost! Ten o'clock, eleven o'clock, twelve o' clock ghost! Midnight! Ghost in the Graveyard!" At this point the group ventures out into the yard or forest in search of the "ghost". If any player sees the ghost, he yells "Ghost in the graveyard!" and all players run as quickly as possible back to base. The goal of the "ghost" is to tag another player, thus making him the "ghost" for the next round. If all players make it back to base safely, the "ghost" retains that role for the next round. Another variant on Ghost in the Graveyard is similar to musical chairs in which there are a finite number of spots, generally referred to as "graves" at the base. For example, in a 5 person game, there may be only 4 "graves". Gameplay continues as above, except after a player finds the ghost and yells, "Ghost in the graveyard!" it is a race back to the base to claim one of the remaining "graves" The last person to arrive with a spot ends up as the "ghost" for the next round.

Line Chasey

Line Chasey is played like normal tag games, only players can only run on lines drawn/painted on the ground (lines of Basketball Court or Netball Court). Players are not allowed to run off the lines, therefore they can easily be trapped if two people are "It".

Manhunt

In Ireland, often called IRA. This is generally played by slightly older players than other forms of tag. The Game consists of 2 teams of roughly equal amount of players. One team is on, and each player on that team secretly has a letter, which may be written on them. The letters all make up a word, which the other team has to figure out. The team thats on gets time to run away, and then the other team has to find them. It is usually played in a large area. Once the team catches someone, they have to torture them, until they reveal their letter, usually by punching them in the arm. Once all the letters have been found, the other team has to figure out the word. It is against the rules to make a captured player reveal any letter other than his, and also for a captured player to lie about their letter.

TV tag

In TV tag, when "it" is about to tag one of the players, the player can avoid being tagged by squating and slapping the ground while calling out the name of a television show. If the player successfully does this, "it" must turn his/her attention to a different player. If the player is too slow, fails to name a show, or repeats one already said by another player, he or she may be tagged, and thus becomes "it". This version can also use other categories, such as movies.

Cops and robbers

Cops and robbers is a tag variant with two teams of one player or more. When played with more than two players, the cops team typically has more members. At the beginning of the game the robber(s) must "steal" a previously assigned object, or touch this. The cop(s) must then chase and catch the robber(s) by tagging them.

Fox and Hounds

This variation is best played in as large an area as possible, with as many participants as can be found. If played in a school, it should use the entire area covered by the grounds and ideally the interior of the building as well. Possibly the best games are played across an entire housing estate and involve more than a hundred players, with rules against players using their homes or gardens as hiding places. Such a game can take several hours to conclude, particularly when some players are very skilled. The game begins with a single player (the "hound") giving the "foxes" a big enough head start to allow them to get out of sight. The hound then gives chase and tries to hunt down the foxes. Upon being tagged (or sometimes, wrestled to the ground), the foxes switch sides and become hounds. Ultimately, all but one of the players will be hounds, chasing down a lone fox. Great kudos is due to any player who can evade the hounds for a great length of time without resorting to foul play. In Australia, this is also known as "Gang-up chasey".

Arrow tig

Similar to 'Fox and Hounds' above, this is played over a large area such as several blocks. The players who are being chased leave chalked arrows on the ground which may or may not give an indication of which way they have gone.

Sharks and Minnows

This game requires a swimming pool to play. To begin, a person is selected to be the "shark" and all the other players, the "minnows," go to one side of the pool. The shark then tells the minnows to swim from one side of the pool to the other while the he/she tries to tag as many minnows as he/she can before they reach the other side of the pool, which serves as a base. When a minnow is tagged by the shark he becomes a shark and all the sharks tell the minnows to swimto the other side of the pool. This process is repeated until there is only one minnow left, who is the winner. The first minnow tagged is then the shark at the beginning of the next game. Sharks and Minnows is best played in the deep end of a swimming pool so that the minnows can try to swim under the shark. This greatly prolongs the game.

Zombie tag

Zombie tag is a game of four or more people split up in teams of two. One team hunts the other. The game is played in stores such as Target, Expo, Burlington and Mervyns. If you are tagged you become a zombie until one "human" remains. Ironically if you win as the last human in the store the next round you are the zombie ("it"). This game originated in Dublin, California and has since spread all across California. It's also known as Matrix tag; "humans" hide from "agents."

Teams

This is played by two teams of roughly equal numbers, sometimes as Boys v. Girls. One team is designated "on" and must catch the players on the other team. When a player is caught he/she is brought to an area called "Jail". Other areas (e.g. a fence, a pole) are designated "Den" and when a player is touching Den he/she cannot be caught. But if a player has stayed in Den for too long a chaser may count down from 10 and the player must run before 0 is reached. Players in Jail can escape if another player on their team gets close enough to touch them. When all of the chased players are in Jail, the teams swap around and the chased team are now "on". If a chased player breaks the rules by jailbreaking without being touched, refusing to leave Den or refusing to go to Jail, his/her team is made "on".

Shadow Tag

A form of tag most often played in mid to late after noon or morning. It is exactly like tag in all respects except that shadows are used. The shadow of the player who is "it" must touch another person's shadow. The other person is now "it."

Color Tag

All players stand on one side of a designated playing field except for one. This person stands in the middle of the field and calls out a color. If the color is visible on any person standing on the edge, that person or persons must attempt to run across the field. If they are caught, they must join the original player in the middle and attempt to catch other players. When everyone has either: A) Reached the other side safely B) Been caught C) Remained where they are because they did not have the color A new color is called out. This is repeated until all players but one are caught. That person goes to the middle, everyone else to the edge, and a new game is started. In Australia, this is known as "All Over, Red Rover". In this variant, the person/people who are 'it' can also call out "All over, red rover!", which forces all players to run.

No Touch Gravel

(Also known as Off Ground Tig/Tag and Grounders) All players excepting the one who is it cannot touch the gravel of the playground. The person who is it may go wherever they wish. Non-it players must jump and remain on playground equipment however they can. If the it person catches a regular player on the gravel then the person who is it yells that so-and-so was found on the gravel and is now it. If a player touches the gravel and gets away with it then they are not pentalized. Similar to the indoor game No Touch Carpet or Hot Lava where the gravel is replaced with carpeting or indoor flooring.

Variants requiring equipment

Some variants of tag use special equipment such as balls, guns, or even flashlights to replace tagging by hand.

Dodgeball

:Main article: Dodgeball Dodgeball is a playground team-based tag game which uses rubber balls. Players throw balls at members of the opposite team to eliminate them from the game.

Flashlight tag

Flashlight tag, also called "Spotlight", is played at night. Rather than physically tagging each other, the "it" player can tag the others by shining a flashlight beam on them. Another variation of this game is when you have the same principle but the "it" player is called your mom. The goal is to kill "your mom". To accomplish this you must chase down "your mom", tie them up, and shine a flashlight in their eyes until they are blinded by the light. Once "your mom" is blinded the first player to catch them becomes the new "your mom". Many of the various games of tag can be played in this manner.

Follow the arrow

This extensive variant requires chalk and a large arena (typically an entire housing estate) and, well played, can last all day. The hiders are given a substantial lead (at least two minutes, often more) and head off, leaving hints as to their route in the form of chalk arrows. They will, from time to time, leave double-headed arrows to confuse the chasers. The chasers (usually a pair, since the game can last a while) must decide which arrows are genuine. If they follow the wrong route they will eventually find a 'double-back' arrow and will have to retrace. It can be played as pure 'chase' or with the object of the hiders coming up behind "it" and tagging them.

Kick the Can

:Main article: Kick the can In Kick the can, tagged players must sit in a "jail" until a free player kicks a soda can or some other object near the jail, freeing everyone.

Laser tag

:Main article: Laser tag Laser tag is very similar to flashlight tag in that it uses beams of light for the purposes of tagging. However, laser tag uses special equipment to avoid the inevitable arguments that arise in flashlight tag about whether one was actually tagged. Players carry "guns" instead, which emit beams of light. They also wear electronic equipment that can detect these beams and thus register being "hit". The equipment can be quite sophisticated, often with built-in scoring systems and various penalties for taking hits.

Paper-ball tag

In this game, "it" must tag the other players by throwing a piece of crumpled paper at them.

Paintball

:Main article: Paintball Paintball is similar to laser tag, except that it uses air guns (usually called "markers") that fire paint pellets to tag other players. Paintball can be played freeform, but games often include complex rules on custom-designed courses.

Phone Tag

:Main article: Phone tag Phone tag is not exactly a game, but more a reference to the game of tag. Phone tag occurs when two senders try to reach each other by telephone but always reach each other's voice mail and leave messages instead. After two or three back and forth messages, it is not uncommon for a person to jokingly say, "Tag, you're it." A more recent derivative of phone tag is IM Tag.

Pickle

Pickle is a form of tag that is played with a ball (generally something soft like a tennis ball) and two bases (usually trees). One player guards each base while the others run between them. Players are safe while touching a base; however, while running from one base to another, players are vulnerable to being tag by balls thrown by the base guards. If a runner is hit by the ball, he replaces the guard who threw it, and that guard becomes a runner.

Spud

:Main article: Spud Spud is a tag variant that is best played in large, open areas. Players begin each round in a central location. "It" then throws a ball high into the air. The other players run but must stop as soon as "it" catches the ball and shouts "Spud!" "It" may then take three large steps toward the player of his choosing before throwing the ball at that player. If the ball hits the target, that player becomes "it", and the game starts over. One variation of Spud requires numbering the participants. "It" throws the ball in the air and calls out a number. Whichever player's number is called instantly becomes "it", and must catch the ball and shout "Spud" as above. This variation does not require all participants to gather in one location at the beginning, but if one player is far away and his or her number is called, it will take longer for him or her to catch the ball. Category:Children's games ja:鬼ごっこ

Aberració de curvatura de camp

Per a d'altres significats, vegeu (desambiguació).

En òptica, una aberració és qualsevol desviació d'un sistema òptic respecte al comportament perfecte; és a dir, qualsevol diferència entre el comportament real i el comportament ideal (astigmàtic) que s'obté amb l'òptica paraxial. Les aberracions més importants són les cinc aberracions monocromàtiques anomenades aberracions de Seidel, que es produeixen independentment del color o freqüència de la llum:
- aberració esfèrica
- aberració de coma: És una aberració obliqua, que té lloc quant els raigs arriben a la lent amb una certa inclinació respecte l’eix òptic. És deguda a que les diferents zones de la lent, proporcionen imatges amb diferent escala. D’aquesta manera succeeix que al lloc on hauria d’haver-hi un punt, en el seu lloc hi ha un estel o “cometa” (d’aquí ve el nom de l’aberració).
- astigmatisme
- aberració de curvatura de camp o de Petzval: ocasionada per la curvatura de les lents, ja que el pla focal d’un objectiu no és totalment pla, sinó que forma una superfície còncava cap a l’objecte. Si el pla sensor de la camera és totalment pla, es fa molt difícil d’enfocar perfectament el centre i les vores de la imatge. Alguns fabricants solucionen aquesta aberració variant el disseny de les lents o corbant el pla sensor en el mateix sentit que el pla focal.
- distorsió A més també cal considerar l'aberració cromàtica, provocada pel fenomen de la dispersió, que fa que per a un sistema òptic donat cada color de la llum tingui una distància focal diferent. Categoria:Òptica

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