TERMIUM Plus®

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LENS BARREL [8 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-04-26

English

Subject field(s)
  • Photography
  • Cinematography
  • Optical Instruments
DEF

Extreme wide-angle lens covering an angular field of over 140 degrees(typically around 180 degrees but can extend to over 200 degrees with increasing "barrel distortion" towards the edges of the field.

French

Domaine(s)
  • Photographie
  • Cinématographie
  • Instruments d'optique
DEF

Terme désignant un objectif à très grand angle (environ 180 degrés) utilisé pour obtenir un champ maximal ou des effets spéciaux.

Spanish

Save record 1

Record 2 2008-02-25

English

Subject field(s)
  • Optics
  • Optical Instruments
  • Television (Radioelectricity)
  • Audiovisual Techniques and Equipment
DEF

A geometric distortion of a rectangular raster causing its boundaries to appear convex.

CONT

A lens suffers from barrel distortion when the images of straight lines are curved lines which are concave to the centre of the plate or film.

OBS

Distinguished from pincushion distortion, positive distorsion.

Key term(s)
  • positive distorsion

French

Domaine(s)
  • Optique
  • Instruments d'optique
  • Télévision (Radioélectricité)
  • Audiovisuel (techniques et équipement)
OBS

Si l'on photographie une grille formée de barreaux droits égaux et équidistants, l'image doit les restituer parfaitement rectilignes; lorsque les barreaux marginaux sont incurvés vers l'extérieur, la distorsion est dite «en barillet», s'ils sont incurvés vers l'intérieur c'est une distorsion «en coussinet» [...]

CONT

Suivant la forme que présentent les courbes représentant la distorsion, on distingue la «distorsion en croissant» et la «distorsion en barillet».

Spanish

Campo(s) temático(s)
  • Óptica
  • Instrumentos ópticos
  • Televisión (Radioelectricidad)
  • Técnicas y equipo audiovisuales
CONT

Al diafragmar una lente simple se produce una distorsión que puede manifestarse con dos aspectos diferentes, según la posición del diafragma [...]: si el diafragma se halla frente a la lente, la imagen dada por ésta adolece de distorsión en barrilete y las rectas de la cuadrícula aparecen como curvas con su concavidad hacia el eje óptico; por el contrario, la posición del diafragma detrás de la lente, da una distorsión en corsé [...]

Save record 2

Record 3 2006-10-06

English

Subject field(s)
  • Photography
DEF

The visual appearance of a darkening of an image toward the edges or periphery.

CONT

While add-on lenses are a powerful tool for expanding your photographic options, you need to take some care to avoid an effect know as--,--is what happens when the lens barrel itself gets into the picture, causing the frame to lose its square shape. Subtle--might simply cause the corners of your pictures to be dark, blurry, or rounded off.

French

Domaine(s)
  • Photographie
DEF

Obscurcissement d'un bord et/ou des coins de l'image pouvant être provoqué, soit par un miroir trop court avec un objectif de longue focale ou un soufflet, [...] soit par un objectif ne couvrant pas le format, soit par un parasol ou autre accessoire optique masquant une partie de l'image [...]

Spanish

Save record 3

Record 4 1999-03-09

English

Subject field(s)
  • Photography
  • Optical Instruments
  • Glass Manufacturing
CONT

On a standard mount, the flange screw is near the back of the lens barrel so that most of the lens projects from the front of the panel when it is screwed home.

French

Domaine(s)
  • Photographie
  • Instruments d'optique
  • Fabrication du verre
DEF

Dispositif mécanique assurant la fixation et le centrage des éléments optiques qui composent l'objectif.

Spanish

Save record 4

Record 5 1999-02-02

English

Subject field(s)
  • Photography
DEF

A lens designed for use on a projection printer [enlarger]. Typically, aberrations are minimized for relatively small object distances, the lens is mounted in a barrel without a shutter, and the diaphragm is equipped with click stops.

CONT

Below the lamphouse lies the negative carrier, which holds the individual negatives flat, and an enlarging lens. Moving the lens toward or away from the negative brings the image into focus, at each size of enlargement.

French

Domaine(s)
  • Photographie
CONT

[Des objectifs d'agrandissement] sont, le plus souvent, des anastigmats corrigés spécialement pour les courtes distances. Leur correction est la même que celle des objectifs pour la photo-macrographie mais, contrairement à ces derniers, ils doivent avoir un angle de champ normal et être parfaitement rectilinéaires.

Spanish

Save record 5

Record 6 1987-05-10

English

Subject field(s)
  • Photography
CONT

[Taking Close-ups. ] With telephoto lenses, first focus on an object at infinitly with the lens mounted normally on the camera. Measure forward from the film plane a distance equal to the focal length of the lens and mark the lens barrel at that point.

French

Domaine(s)
  • Photographie
DEF

Pièce mécanique permettant la fixation et le centrage d'une lentille ou d'un groupe de lentilles dans la monture d'un objectif.

Spanish

Save record 6

Record 7 1976-01-01

English

Subject field(s)
  • Lithography, Offset Printing and Collotype

French

Domaine(s)
  • Lithographie, offset et phototypie

Spanish

Save record 7

Record 8 1975-03-11

English

Subject field(s)
  • Photography
OBS

--s/consist of a metal plate carrying a single hole and can be inserted in a slot in the lens barrel.

French

Domaine(s)
  • Photographie

Spanish

Save record 8

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