in third-stop clicks

French translation: réglage de d'ouverture [du diaphragme] par crans en tiers de valeur

18:39 Aug 19, 2017
English to French translations [PRO]
Tech/Engineering - Photography/Imaging (& Graphic Arts) / Photography
English term or phrase: in third-stop clicks
It's about a lens description. Here's the whole sentence:

Manual focus is also easy, and an obvious to find aperture ring runs from F2 to F22 in third-stop clicks.

Suggestion:

La mise au point manuelle est également facile et une bague de diaphragme directement accessible va de f/2 à f/22 en trois crans.
Jeanne Dumas
France
Local time: 23:00
French translation:réglage de d'ouverture [du diaphragme] par crans en tiers de valeur
Explanation:
the ring on the objective has "clicks" (selectable positions) calibrated in such a way that after 3 clicks you double the amount of light passing through the lenses, so moving one "click" is one third of a jump to "doubling" the light (same principle is applied for the exposure time, or the sensitivity of the film - all done in "3 steps = doubling the value", so 1 click up for the aperture can be compensated by 1 click down in film sensitivity or in exposure time)

https://www.google.co.uk/search?q=réglage du diaphragme et d...

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Note added at 1 hr (2017-08-19 19:52:13 GMT)
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Most digital cameras are calibrated in the same way: you can correct the exposure by steps in such a way that 3 steps up = +1 = doubling the incoming light or 3 steps down = -1 = halving the incoming light

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Note added at 1 day18 hrs (2017-08-21 12:56:31 GMT)
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to make it clearer:

for an hypothetical objective on which you could open/close the diaphragm between F32 and and F2 (i.e. letting through between 1/32 and 1/2 of all incoming light) you would have a range of 4 full steps - you could double the incoming light 4 time:

you could double the light from 1/32 to 1/16, from 1/16 to 1/8, from 1/8 to 1/4 and from 1/4 to 1/2

for EACH of these full steps (each equivalent to "doubling the light" once) you would have 3 stops spaced in "third-stop clicks"

so this (not so) hypothetical objective would have 4x3 = 12 "third-stop clicks" covering the full range of possible opening of the diaphragm

Selected response from:

Daryo
United Kingdom
Local time: 22:00
Grading comment
Merci Nathalie ! J'ai choisi votre réponse.
4 KudoZ points were awarded for this answer



Summary of answers provided
5 +2réglage de d'ouverture [du diaphragme] par crans en tiers de valeur
Daryo
Summary of reference entries provided
Nathalie Stewart

  

Answers


1 hr   confidence: Answerer confidence 5/5 peer agreement (net): +2
setting the aperture on a ring in third-stop clicks
réglage de d'ouverture [du diaphragme] par crans en tiers de valeur


Explanation:
the ring on the objective has "clicks" (selectable positions) calibrated in such a way that after 3 clicks you double the amount of light passing through the lenses, so moving one "click" is one third of a jump to "doubling" the light (same principle is applied for the exposure time, or the sensitivity of the film - all done in "3 steps = doubling the value", so 1 click up for the aperture can be compensated by 1 click down in film sensitivity or in exposure time)

https://www.google.co.uk/search?q=réglage du diaphragme et d...

--------------------------------------------------
Note added at 1 hr (2017-08-19 19:52:13 GMT)
--------------------------------------------------

Most digital cameras are calibrated in the same way: you can correct the exposure by steps in such a way that 3 steps up = +1 = doubling the incoming light or 3 steps down = -1 = halving the incoming light

--------------------------------------------------
Note added at 1 day18 hrs (2017-08-21 12:56:31 GMT)
--------------------------------------------------

to make it clearer:

for an hypothetical objective on which you could open/close the diaphragm between F32 and and F2 (i.e. letting through between 1/32 and 1/2 of all incoming light) you would have a range of 4 full steps - you could double the incoming light 4 time:

you could double the light from 1/32 to 1/16, from 1/16 to 1/8, from 1/8 to 1/4 and from 1/4 to 1/2

for EACH of these full steps (each equivalent to "doubling the light" once) you would have 3 stops spaced in "third-stop clicks"

so this (not so) hypothetical objective would have 4x3 = 12 "third-stop clicks" covering the full range of possible opening of the diaphragm



Daryo
United Kingdom
Local time: 22:00
Native speaker of: Native in SerbianSerbian, Native in FrenchFrench
PRO pts in category: 20
Grading comment
Merci Nathalie ! J'ai choisi votre réponse.

Peer comments on this answer (and responses from the answerer)
agree  Nathalie Stewart: > ...va de f/2 à f/22 en crans avec trois valeurs intermédiaires chacun
9 mins
  -> Merci!

agree  Tony M: ... en crans d'un tier de diaphragme
2 hrs
  -> Thanks!
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Reference comments


1 hr
Reference

Reference information:
http://www.claudegabriel.be/Optique chapitre 5.pdf
...Entre deux valeurs consécutives de la suite des crans de diaphragme..., on choisit trois valeurs intermédiaires, correspondant à des fermetures d'un tiers de cran, d'un demi cran, et de deux tiers de cran de diaphragme...

http://www.eos-numerique.com/forums/f10/fermer-dun-ou-deux-c...
...sur la plupart des objectifs il existe des demi-crans ou des tiers de cran.


http://www.tutos-photo.com/bases-debutant/ouverture-diaphrag...
Les valeurs d'ouverture les plus courantes sont :
f/1,4 ; f/2 ; f/2,8 ; f/4 ; f/5,6 ; f/8 ; f/11 ; f/16 ; f/22 ; f/32.
Il n'y a donc pas que trois ouvertures possibles :)

Nathalie Stewart
France
Native speaker of: Native in EnglishEnglish, Native in FrenchFrench

Peer comments on this reference comment (and responses from the reference poster)
neutral  Daryo: "petit" détail: "trois valeurs intermédiaires" entre deux réglages qui représentent "1 pas" (sur une échelle logarithmique = valeur doublée ) NON PAS entre les deux réglages extrêmes possibles
1 day 16 hrs
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