{"id":11061,"date":"2024-11-29T08:00:00","date_gmt":"2024-11-29T07:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=11061"},"modified":"2024-11-24T10:52:59","modified_gmt":"2024-11-24T09:52:59","slug":"juste-une-mise-au-point","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/11\/29\/juste-une-mise-au-point\/","title":{"rendered":"Juste une mise au point"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"672\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/crayford.jpg\" alt=\"\" class=\"wp-image-11062\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/crayford.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/crayford-300x197.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/crayford-768x504.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/crayford-457x300.jpg 457w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Un t\u00e9lescope est un grand miroir quasi sph\u00e9rique qui concentre la lumi\u00e8re capt\u00e9e sur un second miroir plus petit situ\u00e9 au sommet du tube et qui la renvoie sur le c\u00f4t\u00e9 (Newton) ou bien au fond du tube via un trou dans le miroir principal (Cassegrain). Il y a d\u2019autres subtilit\u00e9s comme la lame de Schmidt pour certains mod\u00e8les ou l\u2019absence de miroir secondaire mais ce n\u2019est pas de sujet du billet.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"999\" height=\"547\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Newtontelescope.png\" alt=\"\" class=\"wp-image-11063\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Newtontelescope.png 999w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Newtontelescope-300x164.png 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Newtontelescope-768x421.png 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Newtontelescope-500x274.png 500w\" sizes=\"auto, (max-width: 999px) 100vw, 999px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"927\" height=\"401\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Casegraintelescope.png\" alt=\"\" class=\"wp-image-11064\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Casegraintelescope.png 927w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Casegraintelescope-300x130.png 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Casegraintelescope-768x332.png 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Casegraintelescope-500x216.png 500w\" sizes=\"auto, (max-width: 927px) 100vw, 927px\" \/><\/figure>\n\n\n\n<p>En plus des miroirs, ces instruments, comme les lunettes, ont besoin d\u2019un oculaire au bout du chemin optique pour fabriquer l\u2019image finale. Lorsque l\u2019on fait de la photographie, l\u2019oculaire est remplac\u00e9 par le capteur de la cam\u00e9ra ou de l\u2019appareil photo.<\/p>\n\n\n\n<p>Pour r\u00e9gler pr\u00e9cis\u00e9ment la nettet\u00e9 de l\u2019image produite, on utilise g\u00e9n\u00e9ralement un porte oculaire. Cette cr\u00e9maill\u00e8re avance et recule l\u2019oculaire le long de l\u2019axe optique de mani\u00e8re pr\u00e9cise pour obtenir une mise au point parfaite.<\/p>\n\n\n\n<p>Je poss\u00e8de un t\u00e9lescope Schmidt Cassegrain c\u2019est \u00e0 dire un instrument qui renvoie la lumi\u00e8re en bas du tube via un trou circulaire dans le miroir principal. Et depuis que j\u2019ai ce t\u00e9lescope Celestron HD 8,\u00a0 je suis confront\u00e9 \u00e0 un probl\u00e8me de mise au point.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Celestron-8.jpg\" alt=\"\" class=\"wp-image-11065\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Celestron-8.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Celestron-8-300x225.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Celestron-8-768x576.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/11\/Celestron-8-400x300.jpg 400w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Sur ce genre d\u2019instrument, une molette situ\u00e9e en bas du tube, permet d\u2019ajuster la nettet\u00e9 de l\u2019image en fonction de l\u2019oculaire ou de la cam\u00e9ra install\u00e9. Il n\u2019y a pas de porte oculaire. Cet ajustement se fait par d\u00e9placement du miroir principal vers le haut ou bien le bas.<\/p>\n\n\n\n<p>De base, la molette ne poss\u00e9dant pas de d\u00e9multiplication, le r\u00e9glage est d\u00e9licat et relativement impr\u00e9cis. Ensuite lorsque l\u2019on inverse le sens du r\u00e9glage, il y a un jeu, appel\u00e9 shifting, qui r\u00e9duit \u00e0 n\u00e9ant quasiment tous vos efforts de mise au point \u00e0 chaque fois que vous changez de sens de rotation pour affiner votre travail. <\/p>\n\n\n\n<p>La fixation des oculaires au t\u00e9lescopes est des plus primitive et lorsque que l\u2019on met un renvoi coud\u00e9 et un oculaire grand champ, le poids de l\u2019ensemble \u00e0 tendance \u00e0 faire basculer l\u2019oculaire vers le bas par simple gravit\u00e9. Oups !Enfin, lorsque vous passez d\u2019un oculaire \u00e0 une cam\u00e9ra, tout de travail de mise au point est \u00e0 refaire, ce qui est rageant.<\/p>\n\n\n\n<p>Donc je me suis d\u00e9cid\u00e9 \u00e0 \u00e9quiper le t\u00e9lescope d\u2019un <a href=\"https:\/\/www.pierro-astro.com\/materiel-astronomique\/accessoires-astronomie\/accessoires-sct\/porte-oculaires-baader-diamond-steeltrack-bds-sc-pour-schmidt-cassegrain-et-maksutov_detail\">porte oculaire type Crayford<\/a>. C\u2019est un gros bout de ferraille que l\u2019on visse \u00e0 l\u2019arri\u00e8re du t\u00e9lescope et qui permet de s\u2019affranchir de la mise au point via le d\u00e9placement du miroir principal.<\/p>\n\n\n\n<p>Le machin co\u00fbte un bras et p\u00e8se le poids d\u2019un \u00e2ne. 350 \u20ac pour 1 kg ! Il permet cependant de supporter une charge utile de 6 kg ce qui est largement plus que ce que j\u2019installe d\u2019ordinaire sur le C8.<\/p>\n\n\n\n<p>Il poss\u00e8de un coulant 2 pouces (par chance j\u2019avais l\u2019adaptateur 1.28), trois molettes de r\u00e9glage dont une d\u00e9multipli\u00e9e X 10, une vis de frein pour verrouiller la mise au point, un rotateur de champ et plein de vis de r\u00e9glage. Un joli bout de ferraille.<\/p>\n\n\n\n<p>\u00c9videmment ajouter 1 kg au cul d\u2019un instrument de 6 kg, cela d\u00e9s\u00e9quilibre pas mal l\u2019ensemble. Il faut le prendre en compte. En plus le Crayford rallonge l\u2019instrument de plusieurs centim\u00e8tres mais par chance il rentre encore dans sa housse de transport.<\/p>\n\n\n\n<p>L\u2019installation est toute simple et son r\u00e9glage \u00e9galement. Il suffit de d\u00e9visser l\u2019adaptateur 1.28 du Celestron et de le visser \u00e0 la place. Pour le r\u00e9glage, on vise une \u00e9toile avec l\u2019instrument, on r\u00e8gle grossi\u00e8rement la position du miroir principal, on ajuste avec le porte oculaire et on verrouille une fois pour toutes la mise au point du Celestron qui ne servira plus \u00e0 rien. Tous les r\u00e9glages se feront via le Crayford.<\/p>\n\n\n\n<p>J\u2019ai test\u00e9 quatre configurations. Un oculaire tout d\u2019abord que j\u2019ai remplac\u00e9 en un rien de temps par une cam\u00e9ra couleur sans avoir \u00e0 changer la mise au point. Ensuite j\u2019ai fix\u00e9 un appareil photo \u00e0 l\u2019aide d\u2019une bague T2 puis ma cam\u00e9ra de guidage pour \u00e9ventuellement faire de la photo plan\u00e9taire. La permutation des diff\u00e9rents \u00e9l\u00e9ments se fait facilement sans avoir \u00e0 changer beaucoup la mise au point. Alors que sans le Crayford, c\u2019\u00e9tait vraiment l\u2019enfer.<\/p>\n\n\n\n<p>Autre avantage non n\u00e9gligeable d\u2019un porte oculaire de type Crayford, le r\u00e9glage de la nettet\u00e9 de l\u2019image ne fait pas vibrer tout l\u2019instrument comme un vieux tacot ce qui rend l\u2019exercice beaucoup plus ais\u00e9.<\/p>\n\n\n\n<p>Bref je suis tr\u00e8s content de cette nouvelle d\u00e9pense non indispensable m\u00eame si il a fallu un bon mois pour \u00eatre livr\u00e9 de la b\u00eate. Du coup, je n\u2019ai pas encore pu le tester lors d\u2019une nuit d\u2019observation \u00e0 cause d\u2019un ciel plus que capricieux ces derniers jours. L\u2019astronomie est une belle \u00e9cole de patience.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Juste une mise au point\u00a0<\/p>\n\n\n\n<p>Sur les plus belles images de ma vie<\/p>\n\n\n\n<p>Sur les clich\u00e9s trop p\u00e2les d&rsquo;une love-story&#8230;<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Pour r\u00e9gler pr\u00e9cis\u00e9ment la nettet\u00e9 de l\u2019image produite, on utilise g\u00e9n\u00e9ralement un porte oculaire. Cette cr\u00e9maill\u00e8re avance et recule l\u2019oculaire le long de l\u2019axe optique de mani\u00e8re pr\u00e9cise pour obtenir une mise au point parfaite. <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/11\/29\/juste-une-mise-au-point\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":11062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,2745,3347,3346],"class_list":["post-11061","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-celestron","tag-crayford","tag-porte-oculaire","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>Juste une mise au point - Le Blog du N\u00e9oprog<\/title>\n<meta name=\"description\" content=\"Cette cr\u00e9maill\u00e8re avance et recule l\u2019oculaire le long de l\u2019axe optique de mani\u00e8re pr\u00e9cise pour obtenir une mise au point parfaite.\" \/>\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\/11\/29\/juste-une-mise-au-point\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Juste une mise au point - 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