{"id":8854,"date":"2023-02-24T08:00:00","date_gmt":"2023-02-24T07:00:00","guid":{"rendered":"http:\/\/www.blog.neoprog.eu\/?p=8854"},"modified":"2023-02-17T18:34:41","modified_gmt":"2023-02-17T17:34:41","slug":"astrophotographie","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/02\/24\/astrophotographie\/","title":{"rendered":"Astrophotographie"},"content":{"rendered":"\n
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Eclipse de soleil le 26 novembre 2022 – Nikon D810 – 85 mm f \/ 11 – 110 ISO – filtre gris neutre<\/figcaption><\/figure>\n\n\n\n

Les plus geeks d\u2019entre-vous le savent sans doute, une com\u00e8te passe en ce moment pr\u00e8s du soleil. Il s\u2019agit de C\/2022 E3 (ZTF) qui ne nous avait pas rendu visite depuis 50 000 ans.<\/p>\n\n\n\n

Une occasion id\u00e9ale pour vous parler astrophotographie, une activit\u00e9 que j\u2019exerce en dilettante. <\/p>\n\n\n\n

La com\u00e8te \u00e9tant \u00e0 peine visible \u00e0 l\u2019\u0153il nu (magnitude de 5 \u00e0 7) dans un ciel pur \u00e9pargn\u00e9 par la pollution lumineuse, l\u2019utilisation d\u2019un appareil photo permet de ne pas manquer l\u2019\u00e9v\u00e9nement. Pour information, la limite des yeux est 6, la pleine Lune a une magnitude de -12.5, Vega 0 et Pluton 13.7.<\/p>\n\n\n\n

La photo du ciel exige des poses longues, car il fait sombre la nuit. Et les poses longues n\u00e9cessitent un pied stable, surtout si vous travaillez avec un objectif lourd pour \u00e9viter les boug\u00e9s. J\u2019arrive a photographier au 1\/30 de seconde sans pied, apr\u00e8s c\u2019est flou. Et ici on parle de temps de pose de une \u00e0 plusieurs secondes.<\/p>\n\n\n\n

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Lune le 3 janvier 2023 – Nikon Z6 II – 500 mm plus doubleur – 1\/100 – f \/11 – 400 ISO<\/figcaption><\/figure>\n\n\n\n

J\u2019embarque un pied Manfrotto tr\u00e8s maniable mais lourd et encombrant. On ne peut pas tout avoir. Il poss\u00e8de un serrage progressif et fiable m\u00eame avec quatre kilogrammes de mat\u00e9riel en \u00e9quilibre pr\u00e9caire.<\/p>\n\n\n\n

Pour l\u2019appareil, je fais le choix d\u2019un capteur tr\u00e8s lumineux et avec une grande plage ISO, celui du Nikon Z6 II est parfait puisqu\u2019il autorise de monter jusque 51 200 ISO. <\/p>\n\n\n\n

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Eclipse partielle de lune 28 juillet 2018 – Nikon D7200 – 500 mm – 1\/400 s – f \/ 5.6 – 100 ISO<\/figcaption><\/figure>\n\n\n\n

Pour les optiques, j\u2019en utilise principalement deux. Un Nikkor Z 24-70 mm ouvert \u00e0 2.8 et un Nikkor F 200-500 mm ouvert \u00e0 5.6 coupl\u00e9 \u00e0 la bague FTZ. Pour la Lune, j\u2019ajoute un doubleur de focale me permettant en format DX d\u2019obtenir une focale de 1.5 m mais \u00e0 f 11.<\/p>\n\n\n\n

Cela donne un sac photo qui doit approcher les dix kilos. Et \u00e0 mon \u00e2ge, dix kilos sur le dos, c\u2019est dur. Je recherche donc des sites d\u2019observation de pr\u00e9f\u00e9rence accessibles en voiture et loin de la route, vous voyez le probl\u00e8me ? Sinon il y a le jardin avec les \u00e9clairages urbains, les lumi\u00e8res des voisins, la pollution atmosph\u00e9rique et le risque de passer pour le pervers du quartier. Faut choisir.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

En ville comme \u00e0 la campagne, je n\u2019ai pas r\u00e9ussi \u00e0 trouver la com\u00e8te \u00e0 l\u2019oeil nu. Je me suis aid\u00e9 de l\u2019application Carte du Ciel et d\u2019une premi\u00e8re photo grand angle pour cibler plus finement mes recherches.<\/p>\n\n\n\n

Pour la mise au point, de nuit, il renoncez \u00e0 l\u2019autofocus. Et m\u00eame avec l\u2019aide \u00e0 la mise au point du Nikon Z6, il faut t\u00e2tonner un peu pour y arriver. En fermant un peu plus le diagramme, genre f 11, cela est un plus facile mais du coup il y a moins de lumi\u00e8re qui arrive jusqu\u2019au capteur.<\/p>\n\n\n\n

Pour le temps d\u2019exposition, vous pouvez respecter la r\u00e8gle des 500 afin d\u2019\u00e9viter le bouger des \u00e9toiles dans le ciel (vous savez les petits traits). La r\u00e8gle est la suivante, divisez 500 par la focale en mm de votre objectif pour obtenir le temps de pause en secondes. En plein format, avec un 500 mm vous pouvez poser une seconde, avec un 24 mm, vingt secondes. Donc si vous ne voulez pas monter en ISO, privil\u00e9giez le grand angle. Avec la lune, j\u2019utilise un temps de pose proche du centi\u00e8me de seconde car notre satellite bouge tr\u00e8s vite dans le viseur avec une grande focale.<\/p>\n\n\n\n

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Com\u00e8te C\/2022 E3 (ZTF) le 12 f\u00e9vrier 2023 – Nikon Z6 II – 500 mm – 1s – f \/ 11 – 51 200 ISO<\/figcaption><\/figure>\n\n\n\n

Pour le d\u00e9clenchement, plusieurs solutions s\u2019offrent \u00e0 vous comme l\u2019application SnapBridge chez Nikon qui vous permet de d\u00e9clencher le bo\u00eetier \u00e0 distance en Bluetooth ou tout simplement le retardateur, fix\u00e9 \u00e0 10 secondes pour les grosses focales, le temps que les vibrations li\u00e9es au d\u00e9clenchement s\u2019amortissent.<\/p>\n\n\n\n

Pour le r\u00e9glage de la sensibilit\u00e9, il faut proc\u00e9der par t\u00e2tonnements en r\u00e9alisant plusieurs clich\u00e9s, \u00e0 2000, 3000, 4000\u2026 Je suis mont\u00e9 jusque 51 200 ISO au 500 mm mais c\u2019est un peu abuser. Il y a presque plus de bruit que de signal.<\/p>\n\n\n\n

Reste le d\u00e9veloppement. Les photographies prises avec une grande sensibilit\u00e9 (ISO \u00e9lev\u00e9s) ont un f\u00e2cheuse tendance \u00e0 \u00eatre bruit\u00e9es fatalement mais \u00e9galement \u00e0 virer dans des couleurs improbables comme le marron rouge.<\/p>\n\n\n\n

Un post traitement s\u2019impose. En jouant sur la luminance, la couleur et les d\u00e9tails, il est possible de r\u00e9duire le bruit. Pour les couleurs, l\u2019augmentation du noir et la r\u00e9duction de la saturation permettent de ramener un fond de ciel plus r\u00e9aliste sans trop d\u00e9naturer l\u2019image.<\/p>\n\n\n\n

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N\u00e9buleuse M 42 le 12 f\u00e9vrier 2023 – Nikon Z6 II – 500 mm – 1s – f \/ 5.6 – 51 200 ISO<\/figcaption><\/figure>\n\n\n\n

Avec juste un t\u00e9l\u00e9objectif, l\u2019astrophotographie d\u2019objets \u00e9loign\u00e9s comme une plan\u00e8te, une com\u00e8te ou une n\u00e9buleuse semblera sans doute relativement mis\u00e9rable en comparaison des clich\u00e9s r\u00e9alis\u00e9s avec des instruments d\u2019observation adapt\u00e9s, mais c\u2019est avant tout le plaisir de capturer le moment, d\u2019immortaliser l\u2019objet dans son appareil qui prime \u00e0 la qualit\u00e9 de l\u2019image.<\/p>\n\n\n\n

\u00c9videmment, l\u2019id\u00e9al serait de photographier \u00e0 l\u2019aide d\u2019un t\u00e9lescope, un projet que je caresse depuis au moins quarante ans, depuis que je ne fais plus d\u2019astronomie dans un club. Mais la plaine d\u2019Alsace ne se pr\u00eate pas trop \u00e0 cette activit\u00e9 et pour avoir un beau ciel, il faut monter dans les Vosges.<\/p>\n\n\n\n

Malgr\u00e9 tout j\u2019y songe s\u00e9rieusement depuis le passage de la com\u00e8te. Aujourd\u2019hui je peux partir en vadrouille la nuit. Mes petits sont grands et ma femme n\u2019est jamais l\u00e0. \u00c9videmment, les voisins risquent de s\u2019inqui\u00e9ter de l\u2019arriv\u00e9e d\u2019un gros tube motoris\u00e9 sur tr\u00e9pied dans le quartier.<\/p>\n\n\n\n

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Lune le 1er juillet 2020 – Nikon D810 – 200 mm – 1\/160 s – f \/ 2.8 – 64 ISO<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Les plus geeks d\u2019entre-vous le savent sans doute, une com\u00e8te passe en ce moment pr\u00e8s du soleil. Il s\u2019agit de C\/2022 E3 (ZTF) qui ne nous avait pas rendu visite depuis 50 000 ans. Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":8855,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[7],"tags":[185,2732,2731,180,351,833,875,660],"class_list":["post-8854","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-photo","tag-astronomie","tag-c-2022-e3-ztf","tag-cometes","tag-lune","tag-materiel","tag-nebuleuses","tag-photographie","tag-soleil","post_format-post-format-image"],"yoast_head":"\nAstrophotographie - Le Blog du N\u00e9oprog<\/title>\n<meta name=\"description\" content=\"La photo du ciel exige des poses longues, car il fait sombre la nuit.\" \/>\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\/2023\/02\/24\/astrophotographie\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Astrophotographie - 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