{"id":580,"date":"2018-11-23T21:48:19","date_gmt":"2018-11-23T20:48:19","guid":{"rendered":"https:\/\/qobra.fr\/blog\/?p=580"},"modified":"2018-11-23T21:52:31","modified_gmt":"2018-11-23T20:52:31","slug":"simple-double","status":"publish","type":"post","link":"https:\/\/qobra.fr\/blog\/blog\/2018\/11\/23\/simple-double\/","title":{"rendered":"simple double"},"content":{"rendered":"<div class=\"mceTemp\"><\/div>\n<div class=\"mceTemp\"><\/div>\n<p>Plusieurs appareils font du double format, c&rsquo;est \u00e0 dire qu&rsquo;ils peuvent, avec le m\u00eame film,\u00a0 faire des vues plus ou moins grandes. Plus la vue est petite, plus on en fait sur la m\u00eame longueur de film.<!--more--><\/p>\n<p>Dans les ann\u00e9es 1920-1930 la plupart des appareils font des vues 6 x 9 cm sur du film 120 ou 620 , ce qui permet 8 photos. En faisant des vues 6 x 4 cm on en fait 16.<\/p>\n<p>De m\u00eame, le format 127 peut \u00eatre utilis\u00e9 en format 4 x 3 cm, qui permet lui aussi de faire 16 vues par film.<\/p>\n<p>Ce double format pose plusieurs probl\u00e8mes pour passer d&rsquo;un format \u00e0 l&rsquo;autre :<\/p>\n<ul>\n<li><strong>la vis\u00e9e<\/strong> : quand la vue est plus petite, la vis\u00e9e doit \u00e9galement couvrir un espace moindre<\/li>\n<li><strong>le clich\u00e9\u00a0<\/strong>: l&rsquo;image sur le film doit \u00e9galement \u00eatre diminu\u00e9e<\/li>\n<li><strong>l&rsquo;avancement du film\u00a0<\/strong>: il faut avancer le film d&rsquo;une longueur moindre lorsqu&rsquo;on utilise le plus petit format.<br \/>\n<hr \/>\n<\/li>\n<\/ul>\n<p>Ces trois r\u00e9glages sont simplement et \u00e9l\u00e9gamment con\u00e7us sur les Agfa Ansco ShurShot :<\/p>\n<ul>\n<li>deux traits sur le viseur indiquent la taille de la petite vis\u00e9e, alors que l&rsquo;ensemble du viseur correspond \u00e0 la grande :<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-582\" src=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialV.jpg\" alt=\"\" width=\"800\" height=\"778\" srcset=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialV.jpg 800w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialV-300x292.jpg 300w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialV-768x747.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul>\n<li>deux volets peuvent \u00eatre rabattus dans le bo\u00eetier pour limiter la taille de la vue pour le petit format, la position ouverte des volets donne le plein format:<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-581\" src=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialAR.jpg\" alt=\"\" width=\"800\" height=\"477\" srcset=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialAR.jpg 800w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialAR-300x179.jpg 300w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoB2ShurShotSpecialAR-768x458.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li>\n<li>le regard inactinique permettant de voir le num\u00e9ro de la vue sur le film lorsqu&rsquo;on le fait avancer est doubl\u00e9. Lorsqu&rsquo;on est en plein format, on utilise un seul des deux regards et on fait avancer le num\u00e9ro de vue de 1 \u00e0 chaque clich\u00e9. Lorsqu&rsquo;on est en demi format : on lit le num\u00e9ro de vue dans le regard inf\u00e9rieur puis, pour la vue suivante, on avance le film jusqu&rsquo;\u00e0 ce que ce <strong>m\u00eame num\u00e9ro<\/strong> se voie dans le regard du haut, pour la vue d&rsquo;apr\u00e8s on regarde \u00e0 nouveau dans le regard inf\u00e9rieur pour voir appara\u00eetre<strong> le num\u00e9ro suivant<\/strong>. De cette mani\u00e8re le num\u00e9ro n&rsquo;avance qu&rsquo;une fois sur deux dans un regard donn\u00e9.\u00a0 Exemple : premier clich\u00e9 pris lorsque <strong>1<\/strong> s&rsquo;affiche dans le regard du bas, deuxi\u00e8me lorsque <strong>1<\/strong> s&rsquo;affiche dans le regard du haut, troisi\u00e8me lorsque <strong>2<\/strong> s&rsquo;affiche dans le regard du bas, quatri\u00e8me lorsque <strong>2<\/strong> s&rsquo;affiche dans le regard du haut\u00a0&#8230;<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-583\" src=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoShurShotRegularB2AR.jpg\" alt=\"\" width=\"800\" height=\"719\" srcset=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoShurShotRegularB2AR.jpg 800w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoShurShotRegularB2AR-300x270.jpg 300w, https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/11\/AgfaAnscoShurShotRegularB2AR-768x690.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3>Agfa Ansco ShurShot Special B2<a href=\"http:\/\/www.collection-appareils.fr\/x\/html\/appareil-5942-Agfa%20Ansco_Shur-Shot%20Special.html\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-214 alignright\" src=\"https:\/\/qobra.fr\/blog\/wp-content\/uploads\/2018\/08\/logoamissite.png\" alt=\"\" width=\"101\" height=\"98\" \/><\/a><\/h3>\n<hr \/>\n<p>Cet appareil est ainsi un double simple.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Plusieurs appareils font du double format, c&rsquo;est \u00e0 dire qu&rsquo;ils peuvent, avec le m\u00eame film,\u00a0 faire des vues plus ou moins grandes. Plus la vue est petite, plus on en fait sur la m\u00eame longueur de film.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[133],"tags":[38,39,40],"class_list":["post-580","post","type-post","status-publish","format-standard","hentry","category-engrenages","tag-agfa","tag-ansco","tag-shurshot"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>simple double - Qobra, appareils photos anciens<\/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:\/\/qobra.fr\/blog\/blog\/2018\/11\/23\/simple-double\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"simple double - Qobra, appareils photos anciens\" \/>\n<meta property=\"og:description\" content=\"Plusieurs appareils font du double format, c&rsquo;est \u00e0 dire qu&rsquo;ils peuvent, avec le m\u00eame film,\u00a0 faire des vues plus ou moins grandes. 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