{"id":10753,"date":"2024-08-07T08:00:00","date_gmt":"2024-08-07T06:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=10753"},"modified":"2024-08-02T15:12:22","modified_gmt":"2024-08-02T13:12:22","slug":"camera-ou-apn","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/08\/07\/camera-ou-apn\/","title":{"rendered":"Cam\u00e9ra ou APN"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"687\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-1024x687.jpg\" alt=\"NGC 7000\" class=\"wp-image-10754\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-1024x687.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-300x201.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-768x515.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-1536x1031.jpg 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o-447x300.jpg 447w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/53870935348_38377c3606_o.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>J\u2019arrive (d\u00e9j\u00e0) \u00e0 un croisement en <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/02\/24\/astrophotographie\/\">astro photographie<\/a>. En trois sorties et <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/07\/26\/seize-heures-pour-deux-photographies\/\">plusieurs heures<\/a> pass\u00e9es devant l\u2019ordinateur, je commence \u00e0 obtenir des images acceptables du ciel profond.\u00a0<\/p>\n\n\n\n<p>Je ne chasse pour l\u2019instant que des objets tr\u00e8s accessibles avec des temps de pose relativement courts mais je vois bien que j\u2019ai pass\u00e9 un cap, surtout avec l\u2019aide de la lunette Skywatcher 72ED. Cet instrument l\u00e9ger et transportable rend le travail beaucoup plus ais\u00e9 grace \u00e0 sa petite focale. La focale c\u2019est la longueur du tube et plus la focale est courte, plus l\u2019instrument est lumineux. Par contre il grossit moins. Le r\u00e9sultat c\u2019est qu\u2019il voit une plus grande portion du ciel et qu\u2019il \u00e0 besoin de moins de temps pour capter la lumi\u00e8re des \u00e9toiles. Du coup le suivi est plus facile et le temps de pose photo plus court.<\/p>\n\n\n\n<p>Depuis le d\u00e9but je photographie avec un <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/07\/28\/mon-beau-nikon\/\">Nikon Z6 II<\/a> Full Frame pass\u00e9 en mode APS-C dont le capteur n\u2019est pas d\u00e9filtr\u00e9. En fran\u00e7ais cela signifie une surface de 16x24mm sur laquelle on trouve un peu plus de dix millions de pixels qui arr\u00eatent certaines fr\u00e9quences comme les infrarouges. Les appareils photos sont con\u00e7us ainsi pour restituer approximativement ce que voit l\u2019\u0153il humain. Nous ne sommes pas capable de voir les couleurs des objets qui brillent au-del\u00e0 de Neptune, sorti des \u00e9toiles, alors tant qu\u2019\u00e0 capter un maximum de lumi\u00e8re, autant tout r\u00e9cup\u00e9rer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"550\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/capteurs.jpeg\" alt=\"\" class=\"wp-image-10755\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/capteurs.jpeg 800w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/capteurs-300x206.jpeg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/capteurs-768x528.jpeg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/capteurs-436x300.jpeg 436w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Beaucoup de n\u00e9buleuses et galaxies rayonnent dans l\u2019infrarouge (l\u2019infrarouge c\u2019est la chaleur), du coup l\u2019appareil photo ne capte pas tout le spectre \u00e9mis et les images sont moins riches en d\u00e9tails.<\/p>\n\n\n\n<p>Une solution pourrait consister \u00e0 d\u00e9filtrer mon Z6 mais je ne pourrais alors plus l\u2019utiliser en photographie classique. Les paysages en infrarouge ce n\u2019est pas mon truc.<\/p>\n\n\n\n<p>D\u2019o\u00f9 l\u2019id\u00e9e de la cam\u00e9ra. Ces \u00e9quipements p\u00e8sent moins de 500 grammes (la moiti\u00e9 d\u2019un appareil photo) et certaines d\u2019entre elles sont refroidies \u00e0 -30 degr\u00e9s ce qui limite le bruit g\u00e9n\u00e9r\u00e9 par le capteur. Oui parce que lorsque l\u2019on photographie longtemps, le capteur chauffe. Et lorsque le capteur chauffe, il g\u00e9n\u00e8re du bruit sur l\u2019image c\u2019est \u00e0 dire de la lumi\u00e8re qui n\u2019existe pas. Les photographes ayant d\u00e9j\u00e0 photographi\u00e9 dans des conditions tr\u00e8s sombres connaissent le ph\u00e9nom\u00e8ne. \u00c0 partir d\u2019un certain niveau, l\u2019image peut se confondre avec le bruit. Donc plus le capteur est froid, moins on a de bruit.<\/p>\n\n\n\n<p>Mais voil\u00e0, une cam\u00e9ra au format APS-C, co\u00fbte plus cher qu\u2019un bo\u00eetier photo du m\u00eame genre. Et m\u00eame ces cam\u00e9ras on\u00e9reuses poss\u00e8dent des d\u00e9fauts. Il y a par exemple le ampglow, sorte de halo lumineux pr\u00e9sent sur le capteur qui ne se corrige qu\u2019avec des images sp\u00e9cifiques, le fait qu\u2019une alimentation 12V 5A est n\u00e9cessaire pour le refroidissement par effet Pelletier ce qui veut dire une batterie plus costaud si vous ne travaillez pas \u00e0 cot\u00e9 d\u2019une prise \u00e9lectrique, l\u2019absence d\u2019\u00e9cran pour visualiser les images obtenues et r\u00e9aliser la mise au point<\/p>\n\n\n\n<p>Bref les cam\u00e9ras sont des sous APN hors de prix.<\/p>\n\n\n\n<p>En plus il faut choisir, entre la cam\u00e9ra monochrome ou la cam\u00e9ra couleur. Les monochromes sont beaucoup plus sensibles car elles ne poss\u00e8dent que des capteurs de luminosit\u00e9 contrairement aux couleurs qui se partagent le m\u00eame nombre de pixels en trois longueurs d\u2019onde. H\u00e9las elles ne photographient qu\u2019en noir et blanc. Du coup il faut utiliser des filtres dans plusieurs longueurs d\u2019ondes pour restituer les couleurs ce qui veut dire poser pendant trois \u00e0 quatre fois plus de temps. Les filtres co\u00fbtent cher et n\u00e9cessitent&nbsp; id\u00e9alement une roue \u00e0 filtre pour passer automatiquement de l\u2019un \u00e0 l\u2019autre sans avoir \u00e0 tout d\u00e9monter. Bref c\u2019est compliqu\u00e9.<\/p>\n\n\n\n<p>Dans mon cas je dois me r\u00e9signer \u00e0 choisir une cam\u00e9ra couleur avec un plus petit capteur tout en conservant de gros photosites. Le hic c\u2019est qu\u2019un plus petit capteur entra\u00eene une r\u00e9duction de la zone du ciel observ\u00e9e et \u00e7a ce n\u2019est pas cool.<\/p>\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<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"1024\" data-id=\"10759\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1325-576x1024.png\" alt=\"\" class=\"wp-image-10759\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1325-576x1024.png 576w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1325-169x300.png 169w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1325.png 750w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"1024\" data-id=\"10760\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1326-576x1024.png\" alt=\"\" class=\"wp-image-10760\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1326-576x1024.png 576w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1326-169x300.png 169w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/IMG_1326.png 750w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/figure>\n<\/figure>\n<\/div>\n<\/div>\n\n\n\n<p>Moi qui me r\u00e9jouissais de disposer d\u2019un grand champ avec la lunette Skywatcher 72ED, son r\u00e9ducteur de focale et un boitier en APS-C, je d\u00e9couvre qu\u2019avec une cam\u00e9ra \u00e0 mille euros je devrais photographier des objets moins \u00e9tendu. Par exemple actuellement je peux photographier la n\u00e9buleuse Am\u00e9rica, la galaxie d\u2019Androm\u00e8de, les Pl\u00e9iades ou les n\u00e9buleuses Trifide et Lagune sur une image. Avec une cam\u00e9ra non. Je n\u2019aurais q\u2019une partie de ces objets.<\/p>\n\n\n\n<p>Il existe bien cam\u00e9ra <a href=\"https:\/\/www.pierro-astro.com\/materiel-astronomique\/cameras-astro\/cameras-ciel-profond\/cam\u00e9ra-zwo-asi2600-pro-refroidie-couleur_detail\">ZWO ASI 2600 MC<\/a> qui poss\u00e8de un capteur 16&#215;24 mm mais bon, elle est au m\u00eame prix qu\u2019un Nikon Z6 II neuf. Du coup mon choix s\u2019est finalement port\u00e9 sur la ZWO <a href=\"https:\/\/www.pierro-astro.com\/materiel-astronomique\/cameras-astro\/cameras-ciel-profond\/cam\u00e9ra-zwo-asi533-pro-refroidie-couleur_detail\">ASI 533 MC Pro<\/a> apr\u00e8s avoir \u00e9cout\u00e9 les conseils de passionn\u00e9s. Un compromis entre mon budget contraint et les exigences techniques.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"431\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1-1024x431.png\" alt=\"\" class=\"wp-image-10756\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1-1024x431.png 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1-300x126.png 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1-768x323.png 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1-500x210.png 500w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/ASI533-english-1.png 1284w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Pourquoi une cam\u00e9ra de la marque chinoise ZWO ? Parce que je suis dans l\u2019\u00e9cosyst\u00e8me ZWO avec l\u2019ordinateur qui pilote ma lunette, un <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/10\/27\/asiair-plus\/\">Asiair Plus<\/a> et la monture qui supporte l\u2019instrument, \u00e0 savoir une <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/12\/22\/zwo-am5\/\">AM5<\/a>. Il est n\u00e9cessaire que tout ce petit monde se comprenne pour que tout fonctionne bien et ZWO est un peu l\u2019Apple de l\u2019astronomie, il ne fonctionne qu\u2019avec lui-m\u00eame.<\/p>\n\n\n\n<p>Pourquoi une cam\u00e9ra couleur ? parce que comme dit plus haut je ne suis pas encore pr\u00eat pour des sessions de huit heures de shooting surtout avec une dizaine de nuits acceptables pour l\u2019astronomie par an et qui durent \u00e0 peine plus de quatre heures en \u00e9t\u00e9. Pourquoi la 533 ? parce qu\u2019elle est vendue actuellement sous le seuil psychologique des mille euros, qu\u2019elle poss\u00e8de un capteur carr\u00e9 faisant 11 mm de cot\u00e9 comprenant 3008&#215;3008 pixels, un niveau de bruit faible et aucun ampglow contrairement \u00e0 certaines autres cam\u00e9ras.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/Camera-ZWO-ASI-533-MC-Pro-Color.jpg\" alt=\"\" class=\"wp-image-10757\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/Camera-ZWO-ASI-533-MC-Pro-Color.jpg 800w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/Camera-ZWO-ASI-533-MC-Pro-Color-300x300.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/Camera-ZWO-ASI-533-MC-Pro-Color-150x150.jpg 150w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/07\/Camera-ZWO-ASI-533-MC-Pro-Color-768x768.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Il va falloir maintenant que je reprenne tous les r\u00e9glages de back focus, c\u2019est \u00e0 dire la distance entre la derni\u00e8re lentille du r\u00e9ducteur de focale et le capteur de la cam\u00e9ra.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Depuis le d\u00e9but je photographie avec un Nikon Z6 II Full Frame pass\u00e9 en mode APS-C dont le capteur n\u2019est pas d\u00e9filtr\u00e9. <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/08\/07\/camera-ou-apn\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":10754,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[2956,3257,185,1894,3189,3047],"class_list":["post-10753","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-apn","tag-asi533","tag-astronomie","tag-camera","tag-nikon-z6-ii","tag-zwo","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cam\u00e9ra ou APN - Le Blog du N\u00e9oprog<\/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.blog.neoprog.eu\/index.php\/2024\/08\/07\/camera-ou-apn\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cam\u00e9ra ou APN - Le Blog du N\u00e9oprog\" \/>\n<meta property=\"og:description\" content=\"Depuis le d\u00e9but je photographie avec un Nikon Z6 II Full Frame pass\u00e9 en mode APS-C dont le capteur n\u2019est pas d\u00e9filtr\u00e9. 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