{"id":9574,"date":"2023-09-20T08:00:00","date_gmt":"2023-09-20T06:00:00","guid":{"rendered":"http:\/\/www.blog.neoprog.eu\/?p=9574"},"modified":"2023-09-17T08:59:23","modified_gmt":"2023-09-17T06:59:23","slug":"le-grossissement","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/09\/20\/le-grossissement\/","title":{"rendered":"Le grossissement"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"292\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/09\/Champ-du-feu.jpg\" alt=\"\" class=\"wp-image-9578\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/09\/Champ-du-feu.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/09\/Champ-du-feu-300x86.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/09\/Champ-du-feu-768x219.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/09\/Champ-du-feu-500x143.jpg 500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Un samedi soir, il y a deux semaines, apr\u00e8s une nuit blanche au Champ du Feu, la <a href=\"https:\/\/safga.eu\">SAFGA<\/a> &#8211; mon nouveau club d&rsquo;astronomie avec lequel je risque de vous saouler rapidement &#8211; organisait une soir\u00e9e de pr\u00e9sentation du ciel \u00e0 la <a href=\"https:\/\/sinestrasbourg.org\">ferme de Bussierre<\/a> \u00e0 Strasbourg. Je n\u2019\u00e9tais pas vraiment frais mais je tenais \u00e0 y participer. Au programme pr\u00e9sentation de Saturne et de quelques autres objets aux nombreux curieux rest\u00e9s tard ce soir l\u00e0.<\/p>\n\n\n\n<p>Je ne vais pas vous mentir, j\u2019adore montrer le ciel aux personnes qui n\u2019ont jamais lev\u00e9 les yeux vers la vo\u00fbte c\u00e9leste la nuit. Le ciel oui, mais surtout les plan\u00e8tes qui parlent nettement plus au grand public que la tache floue d\u2019une n\u00e9buleuse dans l\u2019oculaire.<\/p>\n\n\n\n<p>La plan\u00e8te Saturne, bien visible avec ses anneaux et ses satellites a connu un vif succ\u00e8s. La galaxie d\u2019Androm\u00e8de, l\u2019amas d\u2019Hercules ou le syst\u00e8me double de Mizar et Alcor nettement moins.&nbsp;<\/p>\n\n\n\n<p>Mais outre les &lsquo;Oh&rsquo; et les &lsquo;Ha&rsquo; prononc\u00e9s en contemplant les anneaux de Saturne<a href=\"https:\/\/www.astroshop.eu\/controls\/zwo-asiair-plus-32gb-astrophotography-computer\/p,71358\">,<\/a> la question qui revenait dans chaque bouche ou presque et que je ne me pose jamais est la suivante : \u00ab\u00a0\u00e7a grossi de combien de fois votre instrument ?\u00a0\u00bb<a href=\"https:\/\/www.astroshop.eu\/controls\/zwo-asiair-plus-32gb-astrophotography-computer\/p,71358\">.<\/a> Et je l\u2019avoue humblement ici, j\u2019\u00e9tais bien ennuy\u00e9 pour r\u00e9pondre, faute de conna\u00eetre la formule, d\u2019ailleurs je crois que les astronomes amateurs se moquent le plus souvent de la r\u00e9ponse. Ce qui les int\u00e9resse simplement de savoir est quels oculaire ils peuvent mettre sur leur instrument pour que l\u2019image reste acceptable.<\/p>\n\n\n\n<p>Alors pour ne pas mourir b\u00eate et pour r\u00e9pondre la prochaine fois aux questions, je me suis renseign\u00e9.<\/p>\n\n\n\n<p>Plusieurs param\u00e8tres rentrent en compte dans ces calculs. Le trajet que parcourt la lumi\u00e8re dans l\u2019instrument, on appelle \u00e7a la focale, le diam\u00e8tre du miroir du t\u00e9lescope ou des lentilles de la lunette et la focale de l\u2019oculaire (nettement plus petite que celle de l\u2019instrument). Au fait l&rsquo;oculaire, c&rsquo;est le petit machin rond par lequel on regarde dans un instrument.<\/p>\n\n\n\n<p>Le grossissement est \u00e9gal \u00e0 la focale t\u00e9lescope divis\u00e9e par la focale oculaire. Rien de tr\u00e8s compliqu\u00e9 en fait. Encore faut-il conna\u00eetre la focale de son instrument et m\u00eame \u00e7a je ne le savais pas. Mon Celestron 8 pouces Hedge poss\u00e8de un miroir de 203 mm, une focale de 2000 mm et ouvre \u00e0 f\/10, ce dernier param\u00e8tre int\u00e9ressera particuli\u00e8rement les photographes, car il d\u00e9termine beaucoup la lumi\u00e8re captur\u00e9e par l&rsquo;instrument. En l&rsquo;occurence ici, pas beaucoup.<\/p>\n\n\n\n<p>Donc reprenons, j&rsquo;utilisais un oculaire de 40 mm pour le ciel profond et un oculaire de 15 mm pour les plan\u00e8tes. Vous pouvez donc faire vous m\u00eame le calcul. En ciel profond, le grossissement \u00e9tait de 2000 divis\u00e9 par 40 \u00e7a donne 50. Un grossissement assez faible adapt\u00e9 pour regarder les galaxies et les n\u00e9buleuses. 2000 divis\u00e9 par 15, cela donne 133 fois, un grossissement parfait pour les plan\u00e8tes. On peut voir par exemple avec un peu d&rsquo;imagination la t\u00e2che rouge de Jupiter et bien distinguer les bandes de ces deux plan\u00e8tes g\u00e9antes. On voit m\u00eame le croissant de V\u00e9nus ou Uranus.<\/p>\n\n\n\n<p>Pour r\u00e9colter plus de lumi\u00e8re et observer de grands objets, vous pouvez utiliser un oculaire avec une plus petite focale et pour voir plus de d\u00e9tails il suffit d&rsquo;utiliser un plus gros oculaire. Du moins en th\u00e9orie car les instruments poss\u00e8dent des limitations li\u00e9es \u00e0 l&rsquo;optique. Le grossissent minimum acceptable pour un t\u00e9lescope se calcule ainsi : diam\u00e8tre du miroir principal divis\u00e9 par six. Et le grossissement maximum est \u00e9gal au diam\u00e8tre du miroir multipli\u00e9 par deux.<\/p>\n\n\n\n<p>Pour mon Celestron cela donne 203 divis\u00e9 par 6 soit un grossissement minimum de 33 fois et 203 fois 2 soit un grossissement maximum de 406 fois. Cela veut dire que les oculaires que j&rsquo;utilise doivent se trouver dans une focale comprise entre 60 mm et 5 mm.<\/p>\n\n\n\n<p>Je dispose actuellement d&rsquo;un 40 mm tout a fait acceptable, un tr\u00e8s bon 15 mm \u00e0 grand champ (82\u00b0), un autre 15 mm assez m\u00e9diocre que je peux installer dans un projecteur plan\u00e9taire pour faire de la photographie de plan\u00e8tes, un 9 mm \u00e9pouvantable et un Barlow x 3. L&rsquo;id\u00e9e c&rsquo;est me m&rsquo;offrir prochainement un 6 ou un 8 mm <a href=\"https:\/\/www.astroshop.eu\/eyepieces\/15_10\/m,Explore-Scientific\/a,Zubehoer.Allgemein.Serie=82\u00b0\">Explore Scientific 82\u00b0<\/a> pour remplacer de 9 mm mais pas tout de suite.<\/p>\n\n\n\n<p>Je viens en effet d&rsquo;\u00e9quiper le t\u00e9lescope d&rsquo;un <a href=\"https:\/\/www.astroshop.eu\/controls\/zwo-asiair-plus-32gb-astrophotography-computer\/p,71358\">Asiair<\/a> (un ordinateur d\u00e9di\u00e9 au pilotage d&rsquo;un instrument) et d&rsquo;une cam\u00e9ra guide qui devrait am\u00e9liorer la qualit\u00e9 de mes photographies. J&rsquo;ai pass\u00e9 le WE dans mon salon \u00e0 brancher les c\u00e2bles, \u00e0 jouer avec les logiciels et \u00e0 faire fonctionner l&rsquo;appareil photo ainsi que la cam\u00e9ra, maintenant il faut que j&rsquo;aille sur le terrain tester ce nouveau setup. J&rsquo;ai environ quarante ann\u00e9es d&rsquo;\u00e9volution de l&rsquo;astronomie amateur \u00e0 rattraper et il y a du boulot.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La question qui revenait dans chaque bouche et que je ne me pose jamais est la suivante : \u00ab\u00a0\u00e7a grossi de combien de fois votre instrument ?\u00a0\u00bb. <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/09\/20\/le-grossissement\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":9578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,2944,2945,233,2744],"class_list":["post-9574","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-grossissement","tag-oculaires","tag-optique","tag-telescope","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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