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WikiCards · Card list · Science cards · Varifocal lens
Common card · Science
Varifocal lens, a Common card
A varifocal lens is a camera lens with variable focal length in which focus changes as focal length changes, as compared to a parfocal zoom lens, which remains in focus as the lens zooms.
- Rarity
- Common
- Domain
- Science
- ATK
- 37
- DEF
- 40
- Power
- 77
- Wikipedia reads a year
- 5,300
Power 77 (ATK + DEF): stronger than 20 % of WikiCards cards.
Varifocal lens quiz: 3 questions
Three questions on the Varifocal lens card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The change in the subject size is a ______ problem in video and true parfocal designs are needed for higher quality video work.
Answer
significant. The change in the subject size is a significant problem in video and true parfocal designs are needed for higher quality video work. From the Varifocal lens article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Ingo Molnár. Ingo Molnár 53 · Désiré Charnay 50 · Music City Center 44 · Varifocal lens 37 ATK in WikiCards.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- Many so-called "zoom" lenses, particularly in the case of fixed-lens cameras, are actually varifocal lenses, which give lens designers more flexibility in optical design trade-offs than parfocal zoom.
- These are practical because of autofocus, and because the camera processor can automatically adjust the lens to keep it in focus while changing focal length making it suitable for still photography where a change in magnification of the subject, as demonstrated below is not a problem.
- The change in the subject size is a significant problem in video and true parfocal designs are needed for higher quality video work.
Why it is Common
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Varifocal lens article was read about 5,300 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 37 and blocks with 40: each hit it takes is cut by 16 %.
How to get Varifocal lens
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Science cards
Cards close in power
The cards just above and just below Varifocal lens in the power ranking, all domains together.
- Lancia V6 engineCommon · Science · ATK 49 DEF 28
- Music City CenterCommon · Society · ATK 44 DEF 33
- Sarah Lennox, Duchess of RichmondCommon · History · ATK 50 DEF 27
- Abdulla Bin Zaid Al Mahmoud Islamic Cultural CenterCommon · Arts · ATK 52 DEF 25
- Chi ChengCommon · History · ATK 57 DEF 20
- Denis FonvizinCommon · Arts · ATK 52 DEF 25
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Varifocal lens (revision), CC BY-SA 4.0. Photo : Hustvedt, CC BY-SA 3.0, Wikimedia Commons.
