{"id":13192,"date":"2021-05-03T19:43:04","date_gmt":"2021-05-03T17:43:04","guid":{"rendered":"https:\/\/oi-paris.com\/wordpress\/?p=13192"},"modified":"2021-05-03T20:05:30","modified_gmt":"2021-05-03T18:05:30","slug":"la-forme-sans-les-formes","status":"publish","type":"post","link":"https:\/\/oi-paris.com\/wordpress\/2021\/05\/03\/la-forme-sans-les-formes\/","title":{"rendered":"La Forme sans les formes"},"content":{"rendered":"\n

St\u00e9phane nous a invit\u00e9s \u00e0 une r\u00e9flexion photographique\u00a0: pourquoi les appareils photo dont l\u2019objectif est rond font-ils des images rectangulaires\u00a0?<\/p>\n

Je vais tenter dans cet article de r\u00e9pondre \u00e0 cette question. Attention c\u2019est technique\u00a0!<\/p>\n

Pour les fain\u00e9ants qui ne voudraient pas lire la suite, ou ceux qui ont d\u00e9j\u00e0 lu mon d\u00e9but d\u2019explication sur whatsapp je r\u00e9sume\u00a0: parce que tout n\u2019est que perception.<\/p>\n

Comme dirait Pierre Dac :<\/p>\n

\u00ab Le carr\u00e9 est un triangle qui a r\u00e9ussi, ou une circonf\u00e9rence qui a mal tourn\u00e9 \u00bb<\/em>

Donc dit autrement, si un carr\u00e9 est un rond qui a mal tourn\u00e9, et le carr\u00e9 n\u2019\u00e9tant qu\u2019une sorte de rectangle dont les bords sont \u00e9gaux, des objectifs ronds peuvent bien faire des images rectangulaires.<\/p>\n

\"\"<\/p>\n

\u00a0<\/p>\n

Apr\u00e8s tout, les lames du diaphragme forment un hexagone et les capteurs photosensibles de nos yeux sont des c\u00f4nes situ\u00e9s dans des b\u00e2tonnets, qui sont eux-m\u00eames dans nos yeux sph\u00e9riques\u2026<\/p>\n

Comme souvent dans la vie, tout n\u2019est qu\u2019une question de point de vue. Prenons l\u2019exemple d\u2019un cylindre\u00a0pour bien comprendre\u00a0:<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

Ce n\u2019est pas pour rien que l\u2019on dit qu\u2019il faut tourner autour de son sujet lorsqu\u2019on prend une photo\u00a0!<\/p>\n

Pour conclure, comme pour le mat\u00e9riel ou la technique, la forme importe peu (sauf quand il s\u2019agit de sant\u00e9), seul le r\u00e9sultat compte. Essayons donc avec nos cerveaux sph\u00e9riques de ne pas avoir l\u2019esprit trop carr\u00e9, puisque comme dirait Patrick Vernier\u00a0: \u00ab\u00a0\u00eatre conforme, \u00e7a forme des cons.\u00a0\u00bb<\/p>\n

\u00a0<\/p>\n

Yannick<\/p>\n

\u00a0<\/p>\n

Ps\u00a0: pour ceux qui voudraient une vraie r\u00e9ponse, c\u2019est bien entendu parce que la forme de l\u2019image d\u00e9pend de la forme du capteur. Rectangulaire dont le plus souvent, ou carr\u00e9 quand on utilise un 6×6

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