AskDefine | Define doubler

Dictionary Definition

doubler n : an electronic device that doubles the voltage or the frequency of an input signal

User Contributed Dictionary

English

Noun

  1. One who doubles

French

Etymology

From duplare.

Verb

doubler
  1. to double, duplicate
    A cet instant précis, il a décidé de doubler la mise.
  2. to double-cross
    Nous avons été doublé ce coup-ci.
  3. to overtake, pass
    Sur l'autoroute, nous avons eu l'occasion de doubler de nombreux véhicules.
  4. to dub
    Daniel Beretta qui double Arnold Schwarzenegger en français depuis 1987 a également prêté sa voix à l'agent Sam Fisher.

Conjugation

Derived terms

Extensive Definition

A teleconverter is a secondary lens which is mounted between the camera and a photographic lens. Its job is to enlarge the central part of an image obtained by the objective lens. For example a 2× teleconverter enlarges the central 12×18 mm part of an image to the size of 24×36 mm. Teleconverters are typically made in 1.4×, 2× and 3× models.
The use of a 2× teleconverter (or doubler) gives the effect of using lens with twice the focal length. It also decreases the intensity of the light reaching the film by the factor of 4 (an equivalent of doubling the focal ratio) as well as the resolution (by the factor of 2).
doubler in Czech: Telekonvertor
doubler in German: Telekonverter
doubler in French: Multiplicateur de focale
doubler in Luxembourgish: Telekonverter
doubler in Polish: Telekonwerter
doubler in Russian: Телеконвертер
doubler in Finnish: Polttovälin muuttaja
doubler in Swedish: Telekonverter
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