{"id":10244,"date":"2021-06-18T19:14:02","date_gmt":"2021-06-18T19:14:02","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/cygne-suburbain\/"},"modified":"2025-06-23T21:14:53","modified_gmt":"2025-06-23T19:14:53","slug":"cygne-suburbain","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/cygne-suburbain\/","title":{"rendered":"Cygne suburbain"},"content":{"rendered":"<p>Auteur: Philippe Lousberg (philippe.lousberg@outlook.fr)<\/p>\n<p>Test d&rsquo;un setup l\u00e9ger pour les vacances ce 13\/06 depuis Trooz : Sony a7s d\u00e9filtr\u00e9 Astrodon + filtre Astronomik Clip CLS +objectif Nikon 105 mm diaphragm\u00e9 \u00e0 4.6, le tout sur monture Star Adventurer Mini. Total de 55 poses de 30 sec. \u00e0 2500 ISO entre 0h et 3h, \u00ab\u00a0dithering\u00a0\u00bb manuel toutes les 5 poses, flats et darks, addition sous IRIS, traitement sous SiriL puis GIMP, essentiellement pour les niveaux et la balance des couleurs.<\/p>\n<p><a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cyg_a7s_105mm_13_06_21_reduite_2.jpg\" data-lbwps-width=\"1296\" data-lbwps-height=\"1844\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cyg_a7s_105mm_13_06_21_reduite_2-211x300.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cyg_a7s_105mm_13_06_21_reduite_2-211x300.jpg\" alt=\"\" width=\"211\" height=\"300\" \/><\/a><\/p>\n<p>Rien d&rsquo;original bien s\u00fbr, mais l&rsquo;int\u00e9r\u00eat de l&rsquo;image pour moi est triple :<\/p>\n<p>-j&rsquo;ai \u00e9t\u00e9 surpris par le contraste de l&rsquo;image malgr\u00e9 un ciel suburbain Bortle 6 au minimum, bien aid\u00e9 par le filtre CLS. Je m&rsquo;attendais \u00e0 bien pire.<br \/>\n-montrer l&rsquo;excellente captation du rouge par le capteur d\u00e9filtr\u00e9 (R. Galli), pour ceux qui h\u00e9siteraient \u00e0 le faire. Je joins pour comparaison une image r\u00e9alis\u00e9e en 2019 avant d\u00e9filtrage (pas tout \u00e0 fait le m\u00eame champ ni la m\u00eame \u00e9chelle, objectif de 50 mm, mais c&rsquo;est assez d\u00e9monstratif). Le bo\u00eetier reste par ailleurs tout \u00e0 fait utilisable de jour moyennant une adaptation de la balance des blancs.<br \/>\n-avantage du dithering (ici manuel, tout \u00e0 fait \u00ab\u00a0artisanal\u00a0\u00bb et al\u00e9atoire) qui permet vraiment de r\u00e9duire l&rsquo;effet d\u00e9plaisant \u00ab\u00a0guirlande de No\u00ebl\u00a0\u00bb, c-\u00e0-d des \u00e9toiles multicolores, li\u00e9 sur ce type de capteur au sous-\u00e9chantillonnage en travaillant \u00e0 courte focale sur gros pixels de couleur.<\/p>\n<p><a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cygne_a7s_filtre_2.jpg\" data-lbwps-width=\"694\" data-lbwps-height=\"866\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cygne_a7s_filtre_2-240x300.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/49_20210618-cygne_a7s_filtre_2-240x300.jpg\" alt=\"\" width=\"240\" height=\"300\" \/><\/a><\/p>\n<p>Enfin, aucune brute \u00e0 jeter pour d\u00e9faut de suivi sur cette petite monture mise en station au viseur polaire. Certes, la focale est courte, mais elle fait le job.<\/p>\n<p>A bient\u00f4t<\/p>\n<p>Philippe<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;10244&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;10&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Veuillez voter&quot;,&quot;legend&quot;:&quot;0\\\/10 - (0 vote)&quot;,&quot;size&quot;:&quot;18&quot;,&quot;title&quot;:&quot;Cygne suburbain&quot;,&quot;width&quot;:&quot;0&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: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"6\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"7\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"8\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"9\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"10\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 14.4px;\">\n            <span class=\"kksr-muted\">Veuillez voter<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Auteur: Philippe Lousberg (philippe.lousberg@outlook.fr) Test d&rsquo;un setup l\u00e9ger pour les vacances ce 13\/06 depuis Trooz : Sony a7s d\u00e9filtr\u00e9 Astrodon + filtre Astronomik Clip CLS +objectif Nikon 105 mm diaphragm\u00e9 \u00e0 4.6, le tout sur monture Star Adventurer Mini. Total de 55 poses de 30 sec. \u00e0 2500 ISO entre 0h et 3h, \u00ab\u00a0dithering\u00a0\u00bb manuel [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-10244","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10244"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10244\/revisions"}],"predecessor-version":[{"id":15658,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10244\/revisions\/15658"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}