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infinity lens

French translation: lentille afocale

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14:49 Apr 1, 2011

English to French translations [PRO]
Science - Biology (-tech,-chem,micro-) / microscope

English term or phrase: infinity lens

Bonjour,

je traduis un texte parlant du fonctionnement du microscope. On parle dans ce texte d'une lentille spéciale, "the infinity lens". Sauriez-vous de quel type de lentille il s'agit ?

"The microscope must now make the paths of the light rays converge so that the image can be viewed. To do this it uses another lens - the infinity lens."

blan KudoZ activity Questions: 585 (5 open) (3 without valid answers) (46 closed without grading) Answers: 0
Local time: 17:16

French translation:lentille afocale

Explanation:
afocale. afocal, ale, l'(adjectif) En optique, dit d'un système de lentilles ou dont les maisons sont rejetés à l'infini. ...
savoir.fr/Définition-afocale

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Note added at 52 mins (2011-04-01 15:41:56 GMT)
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Le microscope est formé de deux lentilles, L1 et L2 de distances .... Mais est ce que je dois dire que O2O1=f'1+f'2 (lentille afocale) ou ...
www.ilephysique.net/forum-sujet-173337.html

Selected response from:

GILLES MEUNIER
France
Local time: 17:16

Grading comment

Parfait, merci.
4 KudoZ points were awarded for this answer

Summary of answers provided

4 +3

lentille afocale

GILLES MEUNIER

4 -1

lentille corrigée à l'infini

FX Fraipont

objectif corrigé à l'infini

Roy vd Heijden

Answers

46 mins confidence:

objectif corrigé à l'infini

Explanation:
Exemple :

« Nos objectifs corrigés à l'infini sont conçus pour fournir une image projetée à l'infini. il sont parfait comme lentille d'entrée lors des applications de collimation où la qualité du front d'onde doit être optimale. »
(http://www.newport.com/store/genContent.aspx/Optique-de-coup...

Roy vd Heijden
Belgium
Local time: 17:16
Native speaker of:

Dutch

51 mins confidence:

peer agreement (net): +3

lentille afocale

GILLES MEUNIER
France
Local time: 17:16
Native speaker of:

French
PRO pts in category: 127

Grading comment

Parfait, merci.

28 mins confidence:

peer agreement (net): -1

lentille corrigée à l'infini

Explanation:
"Objectifs de microscope
Dans les microscopes dit « corrigés à l'infini » (au sens de la correction des aberrations), l'objectif fournit une image à l'infini (l'objet étant alors dans le plan focal objet). Une lentille de tube (le tube du microscope) ou lentille de Telan, solidaire du statif, reforme l'image dans le plan focal de l'oculaire. L'objectif est alors caractérisé par son grossissement commercial, et non par son grandissement."
http://fr.wikipedia.org/wiki/Objectif_optique

"L'objectif est la pièce majeure du microscope. C'est lui qui révèle les détails de l'image ... parce qu'il est diaphragmé par le support de sa lentille frontale, pour chaque .... Les objectifs sont calculés pour fournir une image corrigée soit pour une longueur de tube déterminée, soit ils sont corrigés à l'infini. ..."
http://www.microscopies.com/.../MIcroscopies/.../Le Microsco...

Les différentes caractéristiques sont gravées par le constructeur sur la monture de l'objectif : grandissement ou grossissement, ouverture numérique, type de correction de l'objectif (longueur du tube), correction d'aberration, épaisseur de la lamelle couvre-objet, milieu d'immersion, distance de travail... Par exemple, une monture d'objectif portant les inscriptions suivantes :

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Note added at 46 mins (2011-04-01 15:35:45 GMT)
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"Hello,

I think that I will soon write a separate post on this, because the question of infinity corected objectives has already appeared several times. I'll therefore keep myself short in this answer.

1. No, it is not possible to use infinity corrected objectives on the "traditional" DIN microscopes (which have a tube length of 160 mm). The DIN standard is very common and allows for an exchange of objectives from different manufacturers. The threading is even different, so they won't fit.

2. It is also not possible to exchange inifinity objectives between different manufacturers. The tube lens is responsible for not only converging the light of the objective but also correcting lens errors as well and this depends from manufactuerer to manufacturer on how this is done.

3. Many low cost microscopes (as in the use of schools) use traditional DIN objectives becasue of exchangability.

So, what's the whole idea behind infinity objectives? These objectives require an additional lens inside (tube lens) the tube of the microscope. Infinity corrected objectives alone create a parallel light beam (in contrast to DIN objectives, which create a real image). It is therefore possible to introduce filters into the light beam without changing the focus (filters will not change focus of parallel light).

The term "infinity" refers to the fact that these objectives create an image (without the tube lens) in infinite distance, this means never. The light beam does not converge and is parallel."
http://www.microbehunter.com/forum/microscopes-and-optics/in...

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Note added at 1 hr (2011-04-01 16:25:18 GMT)
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"Ce nouveau type de microscope de recherche combine la plage étendue des systèmes ... http://Conception modulaire & lentilles corrigées à l'infini permettent le ..."
http://www.z-sciences.com/.../Microscopes - Metallo crystall...

lentilles corrigées

FX Fraipont
Belgium
Local time: 17:16
Works in field
Native speaker of:

French
PRO pts in category: 59

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French translation: lentille afocale

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