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DISTANCE BETWEEN LENSES [6 records]

Record 1 2012-01-31

English

Subject field(s)
  • Optics
  • Scientific Instruments
DEF

An instrument devised by Smee in 1847 to measure the distance between the optical and geometrical centres of lenses.

French

Domaine(s)
  • Optique
  • Instruments scientifiques
DEF

Appareil qui mesure la distance entre le centre optique et le centre géométrique d'une lentille.

Spanish

Save record 1

Record 2 2011-06-21

English

Subject field(s)
  • Photography
CONT

The total magnification results from multiplying the lens magnification with that of the pocket telescope. The modern lenses the mounts of which offer the comforts of the pre-set diaphragm and the automatic diaphragm presetting device and additionally operate as a natural light trap, too, have, however, when used as a magnifier, a distance somewhat too large between front lens...

Key term(s)
  • diaphragm setting device

French

Domaine(s)
  • Photographie
DEF

Dispositif qui autorise un automatisme du diaphragme lorsqu'on le déclenche.

Spanish

Save record 2

Record 3 2006-05-31

English

Subject field(s)
  • Audiovisual Techniques and Equipment
  • Video Technology
DEF

A camera lens of variable magnification which permits a smooth change of subject coverage between distance and close-up without changing the camera position.

CONT

Projectors can also use zoom lenses. Here zoom lenses are used to increase or decrease the size of the projected image without changing the physical distance between the projector and the screen.

French

Domaine(s)
  • Audiovisuel (techniques et équipement)
  • Vidéotechnique
CONT

On se sert d'un zoom (objectif à focale variable) pour situer le cadre de la prise de vue sous un grand angle et on se rapproche pour bien montrer les détails. C'est pourquoi l'objectif zoom est un composant essentiel d'un système d'enregistrement vidéo.

CONT

[...] les objectifs à focales variables permettent d'obtenir tantôt une vue générale de la classe, tantôt un gros plan sur le travail d'un élève ou sur une manipulation de l'enseignant.

Spanish

Campo(s) temático(s)
  • Técnicas y equipo audiovisuales
  • Técnicas de video
CONT

En cinematografía de aficionados y semiprofesional [...] se ha extendido el uso de objetivos de focal variable que, mediante accionamiento de una planca, permiten hacer variar progresivamente la distancia focal y, consiguientemente, escoger cualquier ángulo de campo comprendido entre los del gran angular y los del teleobjetivo.

Save record 3

Record 4 2002-12-19

English

Subject field(s)
  • Space Exploration Equipment and Tools
CONT

Under contract from the Canadian Space Agency(CSA), the Canadian company, Kinetic Sciences Inc.(KSI), developed a proximity sensor that can provide both image features and range data very near to the surface of the sensor. Because the sensor works without using conventional lenses, it reduces the potential for distorting the image... An important need in many robotics systems is to obtain proximity measurements-which establish how close one object is to another-of the features of an object as it is approached at a close range by the finger tips or robot rippers’. In this situation normal visual sensing tends to be obscured, and can prevent the robot from properly grasping objects or completing tasks. What was required and developed by KSI was a ear-touch proximity sensor that could provide detailed information on the distance and orientation of one object with respect to another for objects between 1 centimetre and 1 millimetre away from the finger tip of the robot.

OBS

proximity sensor: term officially approved by the International Space Station official approval Group (ISSOAG).

French

Domaine(s)
  • Équipement et outillage d'exploration spatiale
OBS

détecteur de proximité : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Spanish

Save record 4

Record 5 2002-04-23

English

Subject field(s)
  • Optical Glass
DEF

A lens with more than one optical center (i.e., a bifocal with two, a trifocal with three, a progressive with many).

CONT

A multifocal lens is a lens that contains two or more different powers or corrections. The most common multifocal lenses are bifocals(two powers) and trifocals(three powers). Quadrafocals, which are four different powers in one lens, are prescribed for special purposes. Another type of multifocal lens, the progressive additional lens, is designed to provide clear vision from far to reading distance without break or interruption. They contain no dividing lines between the different viewing sections.

French

Domaine(s)
  • Verres d'optique
CONT

Un verre multifocal est un verre correcteur supportant plusieurs puissances. Il permet de corriger en même temps la vision de près et la vision de loin. Ce type de verre est destiné aux presbytes. Il existe des verres bifocaux et des verres trifocaux.

OBS

Un verre progressif [...] contrairement à un verre multifocal [...] ne présente pas de saut d'image lors du passage entre différentes zones de vision.

Spanish

Save record 5

Record 6 1998-07-04

English

Subject field(s)
  • Optics
  • Orthoses
  • The Eye

French

Domaine(s)
  • Optique
  • Orthèses
  • Oeil
DEF

Distance mesurée à l'horizontale (généralement sur la ligne datum), côté nasal, entre les bords biseautés des deux verres d'une paire de lunettes.

OBS

Source MVISI-F : Le nouveau dictionnaire de la vision par Michel Millodot, Médiacom Vision Éditeur, 1997.

Spanish

Save record 6

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