{"id":96,"date":"2020-04-28T17:51:57","date_gmt":"2020-04-28T15:51:57","guid":{"rendered":"https:\/\/www.neocatalys.fr\/blog\/?p=96"},"modified":"2021-09-29T18:19:20","modified_gmt":"2021-09-29T16:19:20","slug":"fabriquez-votre-stenope-partie-2-calcul-du-temps-de-pose","status":"publish","type":"post","link":"https:\/\/www.neocatalys.fr\/blog\/fabriquez-votre-stenope-partie-2-calcul-du-temps-de-pose\/","title":{"rendered":"Le st\u00e9nop\u00e9 Partie II : Calcul du temps de pose"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-right kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;right&quot;,&quot;id&quot;:&quot;96&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;8&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;3.7&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;4&quot;,&quot;greet&quot;:&quot;Notez cet post&quot;,&quot;legend&quot;:&quot;3.7\\\/5 - (8 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Le st\u00e9nop\u00e9 Partie II : Calcul du temps de pose&quot;,&quot;width&quot;:&quot;101.6&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 101.6px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            3.7\/5 - (8 votes)    <\/div>\n    <\/div>\n\n<p>Tout est pr\u00eat, qu\u2019est-ce que je fais maintenant ?&nbsp;<\/p>\n\n\n\n<p>Encore un peu de patience, avant de pouvoir faire des photos, il va nous falloir faire quelques calculs.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pr\u00e9paration du mat\u00e9riel :<\/strong>&nbsp;<\/h3>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\"><li>Le st\u00e9nop\u00e9 <\/li><li>un posem\u00e8tre (\u00e0 d\u00e9faut la cellule d&rsquo;un appareil photo fera l&rsquo;affaire) <\/li><li>une calculatrice&nbsp;.<\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00e9rification du diam\u00e8tre et de la r\u00e9gularit\u00e9 du trou.&nbsp;<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05471-768x1024.jpg\" alt=\"\" class=\"wp-image-164\" srcset=\"https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05471-768x1024.jpg 768w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05471-338x450.jpg 338w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05471-640x853.jpg 640w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05471.jpg 1125w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<p>Une fois le st\u00e9nop\u00e9 fabriqu\u00e9, il nous reste \u00e0 conna\u00eetre le diam\u00e8tre du trou que l&rsquo;on a r\u00e9alis\u00e9 et v\u00e9rifier que celui-ci est le plus circulaire possible. <\/p>\n\n\n\n<p>La m\u00e9thode la plus simple consiste \u00e0 scanner notre plaque \u00e0 une r\u00e9solution assez \u00e9lev\u00e9e (au moins 400 dpi), puis \u00e0 l\u2019aide d\u2019un programme de dessin (Photoshop ou autre) de mesurer sa taille. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473-1024x768.jpg\" alt=\"\" class=\"wp-image-165\" srcset=\"https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473-1024x768.jpg 1024w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473-450x338.jpg 450w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473-768x576.jpg 768w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473-640x480.jpg 640w, https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/08\/DSC05473.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Dans Photoshop, la mesure se fait gr\u00e2ce \u00e0 l&rsquo;outil de mesure. On place un point de chaque c\u00f4t\u00e9 de notre trou afin de d\u00e9finir le diam\u00e8tre. Il ne nous reste plus qu&rsquo;\u00e0 lire la dimension que l&rsquo;on vient de mesurer dans la fen\u00eatre d&rsquo;infos. Attention la dimension s&rsquo;affiche dans l&rsquo;unit\u00e9 choisie, donc n&rsquo;oubliez pas de r\u00e9gler l&rsquo;unit\u00e9 en mm (dans la palette infos, cliquez avec le bouton de droite sur le petit triangle noir a cot\u00e9 du x,y, pour choisir les millim\u00e8tres). Ici, nous obtenons un trou compris entre 0.3 mm et 0.4 mm.<br>Faites chauffer la calculatrice !&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"> <strong>la taille Optimale du trou<\/strong> <\/h4>\n\n\n\n<p>La chose \u00e0 faire maintenant est de v\u00e9rifier que notre st\u00e9nop\u00e9 est \u00ab\u00a0fonctionnel\u00a0\u00bb, pour cela nous allons calculer&nbsp;<strong>la taille Optimale du trou<\/strong>. Bien qu\u2019il n\u2019y ai pas de lentille, nous appellerons&nbsp;<strong>longueur focale<\/strong>&nbsp;la distance entre le plan-film (le fond de la bo\u00eete) et le trou. De nombreuses formules de calcul du diam\u00e8tre optimal existent mais en voici une simplifi\u00e9e qui fonctionne :<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"330\" height=\"74\" src=\"https:\/\/www.neocatalys.fr\/blog\/wp-content\/uploads\/2021\/09\/formule.jpg\" alt=\"\" class=\"wp-image-216\"\/><\/figure><\/div>\n\n\n\n<p>Avec <strong>d<\/strong>: diam\u00e8tre du trou (en millim\u00e8tre)&nbsp;<strong>f<\/strong>: longueur focale (en millim\u00e8tre) Cette formule vous permettra de savoir si le diam\u00e8tre de votre trou est suffisant ou si vous devez le modifier. Le cercle image produit par un trou optimal est \u00e9gal \u00e0 3,5 fois la longueur focale. Ce qui veut dire que si vous avez une distance focale de 10 cm, vous obtiendrez une image de 35 cm de diam\u00e8tre sur le fond de la bo\u00eete, ce qui est largement suffisant pour couvrir toute la surface de de notre papier.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment calculer le temps de pose&nbsp;?<\/h3>\n\n\n\n<p><strong>Sensibilit\u00e9 du support :<\/strong>&nbsp;Pour le support et par simplicit\u00e9 je vais utiliser du papier photo. La plupart des papiers photo du commerce on une sensibilit\u00e9 approximative de 6 ISO.&nbsp;<\/p>\n\n\n\n<p><strong>Le diaphragme du st\u00e9nop\u00e9<\/strong>&nbsp;se d\u00e9termine de la mani\u00e8re suivante :<\/p>\n\n\n\n<h3 class=\"has-text-align-center wp-block-heading\">f=F\/A<\/h3>\n\n\n\n<p>Avec&nbsp;<br><strong>f<\/strong>&nbsp;: diaphragme&nbsp;<br><strong>A<\/strong>&nbsp;: diam\u00e8tre du trou&nbsp;<br><strong>F<\/strong>&nbsp;: longueur focale <\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 cette formule, on conna\u00eet maintenant&nbsp;<strong>le diaphragme<\/strong>&nbsp;de notre appareil. Comme on conna\u00eet \u00e9galement la<strong> sensibilit\u00e9<\/strong>&nbsp;de notre papier, il ne reste plus qu\u2019\u00e0 calculer le temps de pose. Pour cela, nous allons utiliser tout simplement un posem\u00e8tre pour les premiers essais. Si vous n\u2019avez pas de cellule, vous pouvez utiliser celle de votre appareil photo qui vous donnera une valeur approximative assez correcte. Donc il suffit que je r\u00e8gle la cellule sur 6 ISO (sensibilit\u00e9 de mon papier photo) et le diaphragme sur 64 (c\u2019est la valeur max de ma cellule), il suffira de multiplier le temps de pose obtenu pour obtenir la bonne valeur pour une focale \u00e9quivalente \u00e0 celle de votre st\u00e9nop\u00e9 (voir tableau de diaphragme en bas de page). <\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>O<\/strong>n obtient donc un premier temps de pose&nbsp;<\/h4>\n\n\n\n<p><strong>R\u00e9ciprocit\u00e9<\/strong>&nbsp;: Avec des films traditionnels, lorsque votre temps de pose d\u00e9passe 1 \u00e0 2 secondes, vous devrez corriger ce temps pour prendre en compte les lois de r\u00e9ciprocit\u00e9 et donc augmenter le temps de pose pour \u00e9viter les sous expositions. Nous, on a de la chance parce qu\u2019on utilise du papier photo et que celui-ci ne montre pas de r\u00e9ciprocit\u00e9 en dessous de 2 minutes de pose environ. Au del\u00e0 de deux minutes, il faudra augmenter le temps de pose par rapport au temps calcul\u00e9. <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Petit tableau pour le diaphragme&#8230;<\/h4>\n\n\n\n<p> Diaphragme : <\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>16<\/td><td>22<\/td><td>32<\/td><td>45<\/td><td>64<\/td><td>90<\/td><td>128<\/td><td>180<\/td><td>256<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>A chaque fois qu&rsquo;on augmente de diaphragme, le temps de pose est multipli\u00e9 par 2. Voil\u00e0 maintenant, on sait tout. Il ne reste plus qu\u2019\u00e0 sortir dehors s\u2019amuser avec nos beaux appareils. On peut passer \u00e0 la troisi\u00e8me \u00e9tape <a href=\"https:\/\/www.neocatalys.fr\/blog\/fabriquez-votre-stenope-partie-3-la-prise-de-vue\/\">:&nbsp;<strong>La Prise de vue<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tout est pr\u00eat, qu\u2019est-ce que je fais maintenant ?&nbsp; Encore un peu de patience, avant de pouvoir faire des photos, il va nous falloir faire quelques calculs.&nbsp; Pr\u00e9paration du mat\u00e9riel<\/p>\n<p class=\"more-link\"><a href=\"https:\/\/www.neocatalys.fr\/blog\/fabriquez-votre-stenope-partie-2-calcul-du-temps-de-pose\/\" class=\"readmore\">Lire la suite<svg class=\"icon icon-angle-right\" aria-hidden=\"true\" role=\"img\"> <use href=\"#icon-angle-right\" xlink:href=\"#icon-angle-right\"><\/use> <\/svg><span class=\"screen-reader-text\">Le st\u00e9nop\u00e9 Partie II : Calcul du temps de pose<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-96","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le st\u00e9nop\u00e9 Partie II : Calcul du temps de pose -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.neocatalys.fr\/blog\/fabriquez-votre-stenope-partie-2-calcul-du-temps-de-pose\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le st\u00e9nop\u00e9 Partie II : Calcul du temps 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