{"id":729,"date":"2019-04-07T17:13:13","date_gmt":"2019-04-07T15:13:13","guid":{"rendered":"http:\/\/masdeminge\/Test-Wordpress\/?page_id=729"},"modified":"2024-06-03T15:53:28","modified_gmt":"2024-06-03T13:53:28","slug":"temps-de-pose","status":"publish","type":"page","link":"https:\/\/motsdaubepine.fr\/caussemots\/index.php\/temps-de-pose\/","title":{"rendered":"Temps de pose"},"content":{"rendered":"<p><span style=\"font-size: 14pt; color: #0000ff;\"><strong>Temps de pose : conseils g\u00e9n\u00e9raux<\/strong><\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Les valeurs les plus courantes sont entre 1 mm et 10 mm<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Une dizaine de secondes pour la n\u00e9buleuse d&rsquo;Orion avec le Newton<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Le temps de pose sur un APN est bien plus important que le r\u00e9glage ISO<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Plus le temps de pose est court plus l&rsquo;ISO doit \u00eatre \u00e9lev\u00e9e<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Si le temps de pose est estim\u00e9 \u00e0 30 minutes par exemple pr\u00e9f\u00e9rer une des s\u00e9quences suivantes plut\u00f4t qu&rsquo;une fois 30 minutes<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 12pt;\">3x 10 mm<\/span><\/li>\n<li><span style=\"font-size: 12pt;\">6x 5 mm<\/span><\/li>\n<li><span style=\"font-size: 12pt;\">10 x 3mm<\/span><\/li>\n<\/ul>\n<h4><a href=\"https:\/\/ciel-astro-ccd.com\/wp\/temps_exposition\/\">Plus d&rsquo;informations sur le site de Richard Beauregard\u00a0<\/a><\/h4>\n<h4><a href=\"https:\/\/ciel-astro-ccd.com\/wp\/temps_exposition\/\">Et sur ce site<\/a><\/h4>\n<p>&nbsp;<\/p>\n<h4><strong>Relation temps de pose et rapport d&rsquo;ouverture<\/strong><\/h4>\n<p>Appelons la quantit\u00e9 N = <abbr title=\"Focale\/Diam\u00e8tre\"><abbr title=\"Focale\/Diam\u00e8tre\">f\/D<\/abbr><\/abbr> le nombre d&rsquo;ouverture de l&rsquo;instrument si l&rsquo;on a 2 instruments ayant une ouverture N1 et N2 respectivement et que N2 = k x N1 alors pendant un temps de pause fix\u00e9 \u00e0 l&rsquo;avance la quantit\u00e9 de lumi\u00e8re re\u00e7ue par l&rsquo;instrument 2 vaut : E2 = E1 \/ (k * k) donc si on retourne le probl\u00e8me pour savoir quel sera le temps de pause n\u00e9cessaire afin que l&rsquo;instrument 2 re\u00e7oive la m\u00eame\u00a0quantit\u00e9 de lumi\u00e8re\u00a0:\u00a0Tp2 = Tp1 * k * k.<\/p>\n<p>Exemple :<\/p>\n<p>Newton 1200\/250\u00a0\u00a0 N1 = 4,8<\/p>\n<p>Newton 900\/250\u00a0\u00a0\u00a0 N2 = 3,6<\/p>\n<p>K =3,6\/4,8 = 0,75<\/p>\n<p>Si Tp1 = 60 seconde sur Newton 1200\/250\u00a0 , Tp2 = 60*0,75*0,75\u00a0 = 34 secondes sur le Newton 900\/250<\/p>\n<p>Le temps de pose \u00e9volue avec le carr\u00e9 de l&rsquo;ouverture<\/p>\n<p>Si utilisation d&rsquo;un Maksutov 1500\/127\u00a0 N2 = 11,8<\/p>\n<p>K = 11,8\/4,8 =\u00a0 2,46<\/p>\n<p>Si Tp1 = 60 seconde sur Newton 1200\/250\u00a0 , Tp2 = 60*2,46*2,46\u00a0 = 364 secondes sur le Maksutov , soit environ 6 fois plus<\/p>\n<h4><strong>Relation temps de pose et diam\u00e8tre de l&rsquo;ouverture<\/strong><\/h4>\n<p>le rapport entre l&rsquo;intensit\u00e9 de l&rsquo;objet capt\u00e9e et la surface sur laquelle cette image s&rsquo;imprime sur le capteur est proportionnel \u00e0 D\u00b2\/F\u00b2 ou \u00e0 1\/(F\/D)\u00b2.<\/p>\n<p><strong>&#8211; Avec deux t\u00e9lescopes de m\u00eame diam\u00e8tre, celui avec le plus petit rapport F\/D (ou la plus courte focale) sera le plus lumineux.<\/strong><\/p>\n<p><strong>&#8211; Avec deux t\u00e9lescopes de m\u00eame focale, celui avec le plus grand diam\u00e8tre sera le plus lumineux.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Exemple : Photographie d&rsquo;Orion APN Nikon et Newton F 1200 D 250 ou l&rsquo;on d\u00e9tecte un temps de pose trop long\u00a0 pour les poses unitaires.<br \/>\n<\/strong><\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Temps de pose unitaire\u00a0 : 120 secondes, ISO 1250. <\/strong><\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Il est pr\u00e9f\u00e9rable de faire 12 photos de 10 secondes puis de les empiler avec deepskystacker ,\u00a0 iris ou Siril. <\/strong><\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>La deuxi\u00e8me photo ci-dessous a \u00e9t\u00e9 faite avec cette technique : 20 prises de vue en Raw , Nikon D7100 , 45 sec ISO 100O assembl\u00e9es avec Siril<br \/>\n<\/strong><\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Ces deux photos ont \u00e9t\u00e9 faite avec le m\u00eame t\u00e9lescope et le m\u00eame APN<br \/>\n<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-733 size-full\" src=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42.jpg\" alt=\"\" width=\"4020\" height=\"6036\" srcset=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42.jpg 4020w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42-200x300.jpg 200w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42-768x1153.jpg 768w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2019\/04\/M42-682x1024.jpg 682w\" sizes=\"auto, (max-width: 4020px) 100vw, 4020px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_1714\" style=\"width: 5389px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1714\" class=\"wp-image-1714 size-full\" src=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_.jpg\" alt=\"Orion-V1.recadr\u00e9e.WEB\" width=\"5379\" height=\"3586\" srcset=\"https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_.jpg 5379w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_-300x200.jpg 300w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_-768x512.jpg 768w, https:\/\/motsdaubepine.fr\/caussemots\/wp-content\/uploads\/2022\/01\/Orion-V1.recadr\u00e9e.WEB_-1024x683.jpg 1024w\" sizes=\"auto, (max-width: 5379px) 100vw, 5379px\" \/><\/a><p id=\"caption-attachment-1714\" class=\"wp-caption-text\">23 Janvier 2022 : N\u00e9buleuse d&rsquo;Orion M42, 20 prises de vue en Raw , Nikon D7100 , 45 sec ISO 100O , traitements avec Siril<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Temps de pose : conseils g\u00e9n\u00e9raux Les valeurs les plus courantes sont entre 1 mm et 10 mm Une dizaine de secondes pour la n\u00e9buleuse d&rsquo;Orion avec le Newton Le temps de pose sur un APN est bien plus important <a class=\"more-link\" href=\"https:\/\/motsdaubepine.fr\/caussemots\/index.php\/temps-de-pose\/\">Lire plus &#8230;<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-729","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Temps de pose - L&#039;observatoire du Causse...mots<\/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:\/\/motsdaubepine.fr\/caussemots\/index.php\/temps-de-pose\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Temps de pose - L&#039;observatoire du Causse...mots\" 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