18:39 Aug 19, 2017 |
English to French translations [PRO] Tech/Engineering - Photography/Imaging (& Graphic Arts) / Photography | |||||||
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| Selected response from: Daryo United Kingdom Local time: 00:40 | ||||||
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5 +2 | réglage de d'ouverture [du diaphragme] par crans en tiers de valeur |
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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 |
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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 :) |
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