TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
SPEED LENS [1 record]
Record 1 - internal organization data 2004-05-10
Record 1, English
Record 1, Subject field(s)
- Optics
- Photography
Record 1, Main entry term, English
- lens speed
1, record 1, English, lens%20speed
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The largest lens opening [smallest f-number] at which a lens can be set. 2, record 1, English, - lens%20speed
Record number: 1, Textual support number: 1 CONT
Lens speed is determined by the maximum aperture of the lens (the largest lens opening or the smallest f-number) in relation to it's focal length. The "speed" of a lens is relative, a 400 mm lens with a maximum aperture of f/3.5 is considered extremely fast, while a 28mm f/3.5 lens is thought to be relatively slow. 3, record 1, English, - lens%20speed
Record number: 1, Textual support number: 1 OBS
A "fast" lens transmits more light and has a larger opening than a "slow" lens. 2, record 1, English, - lens%20speed
Record 1, Key term(s)
- speed of a lens
Record 1, French
Record 1, Domaine(s)
- Optique
- Photographie
Record 1, Main entry term, French
- clarté d'un objectif
1, record 1, French, clart%C3%A9%20d%27un%20objectif
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- rapidité d'un objectif 2, record 1, French, rapidit%C3%A9%20d%27un%20objectif
feminine noun
- luminosité d'un objectif 2, record 1, French, luminosit%C3%A9%20d%27un%20objectif
feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
La plus grande ouverture [...] sur laquelle on peut régler l'objectif grâce au diaphragme. 1, record 1, French, - clart%C3%A9%20d%27un%20objectif
Record number: 1, Textual support number: 1 OBS
Un objectif «clair» transmet plus de lumière et a une ouverture plus grande qu'un objectif de petite ouverture. 1, record 1, French, - clart%C3%A9%20d%27un%20objectif
Record number: 1, Textual support number: 2 OBS
Caractéristiques d'un objectif. [...] Sa luminosité. C'est sa capacité à absorber et restituer la luminosité de votre scène. La luminosité ou ouverture se caractérise par le sigle «f» et un chiffre, plus le chiffre est petit (ex : 1.4 ou 1.8) plus votre objectif est lumineux. Plus un objectif est lumineux plus il autorise des vitesses élevées, une profondeur de champs restreinte donc de très jolis flous et plus son prix augmente. 2, record 1, French, - clart%C3%A9%20d%27un%20objectif
Record 1, Spanish
Record 1, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2024
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
Language Portal of Canada
Access a collection of Canadian resources on all aspects of English and French, including quizzes.
Writing tools
The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies
Access Translation Bureau glossaries and vocabularies.
- Date Modified: