{"id":9527,"date":"2023-09-08T08:00:00","date_gmt":"2023-09-08T06:00:00","guid":{"rendered":"http:\/\/www.blog.neoprog.eu\/?p=9527"},"modified":"2023-09-02T09:29:19","modified_gmt":"2023-09-02T07:29:19","slug":"lequilibre","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/09\/08\/lequilibre\/","title":{"rendered":"L’\u00e9quilibre"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Quand vous trimbalez un \u00e9quipement de 50 kilos dans le coffre, vous n\u2019imaginez pas forc\u00e9ment que vous allez marcher en \u00e9quilibre sur un fil.<\/p>\n\n\n\n

Mais voil\u00e0, un t\u00e9lescope install\u00e9 sur une monture \u00e9quatoriale motoris\u00e9e, c\u2019est du r\u00e9glage d\u2019horlogerie malgr\u00e9 son poids.<\/p>\n\n\n\n

Le tube du t\u00e9lescope p\u00e8se plus de 6 kilos et n\u00e9cessite un contrepoids de 5,5 kilos pour l\u2019\u00e9quilibrer sur ses deux axes, d\u00e9clinaison et ascension droite.<\/p>\n\n\n\n

Mais sur le tube, vous allez \u00e9galement installer un chercheur, un renvoi coud\u00e9, un oculaire, peut-\u00eatre un appareil photo, et le poids initial de 6 kilos passe rapidement \u00e0 8 voire 9 kilos avec un fort moment du fait que l\u2019appareil se retrouve au bout du tube \u00e0 plusieurs centim\u00e8tres \u00e0 l\u2019arri\u00e8re du miroir.<\/p>\n\n\n\n

Dans cette configuration, je suis oblig\u00e9 de placer le contrepoids au point le plus \u00e9loign\u00e9 de la monture, de remonter le tube le long de son axe et m\u00eame ainsi, l\u2019\u00e9quilibre est tr\u00e8s pr\u00e9caire.<\/p>\n\n\n\n

Du coup j\u2019ai ajout\u00e9 un contrepoids de 3 kilos sur la monture et une masselotte de 800 grammes \u00e0 l\u2019avant du t\u00e9lescope, sur un rail bricol\u00e9 pour l\u2019occasion pour compenser la masse de l\u2019appareil.<\/p>\n\n\n\n

\u00c0 chaque changement d\u2019\u00e9quipement, je dois r\u00e9\u00e9quilibrer le t\u00e9lescope, d\u00e9placer les contrepoids et les masselottes sur leur axe.<\/p>\n\n\n\n

L\u2019autre solution consisterait \u00e0 all\u00e9ger la charge utile. Et cela tombe bien puisque je dispose \u00e9galement d\u2019un petit appareil photo hybride Panasonic Lumix G9. Il pourrait me servir pour la photographie par projection. <\/p>\n\n\n\n

La photographie par projection est une m\u00e9thode qui consiste \u00e0 placer un oculaire au foyer du t\u00e9lescope et le bo\u00eetier derri\u00e8re. Cette technique, qui permet de faire de la photographie plan\u00e9taire,  n\u00e9cessite un long adaptateur de 10 cm dans lequel il faut glisser l\u2019oculaire et au bout duquel est viss\u00e9 le bo\u00eetier photo sur une bague T2.<\/p>\n\n\n\n

Le poids de l\u2019oculaire plus celui de l\u2019adaptateur, de la bague d\u2019adaptation T2 et du bo\u00eetier photo sans parler du moment g\u00e9n\u00e9r\u00e9 par la longueur de l\u2019ensemble rendent l\u2019installation tr\u00e8s instable. Du coup je vais tester les qualit\u00e9s astro photos du G9, qui est un bo\u00eetier 4\/3, pour cette configuration. Il p\u00e8se 500 grammes de moins que le Z8.<\/p>\n\n\n\n

Me voil\u00e0 donc avec deux adaptateurs T2, un pour monture Z, l\u2019autre pour micro 4\/3, un adaptateur pour la projection, un nouveau contrepoids, deux masselottes, un rail de 69 cm et un bo\u00eetier photo suppl\u00e9mentaire \u00e0 emporter lors des sorties astronomiques.\u00a0<\/p>\n\n\n\n

Apr\u00e8s une nuit d’insomnie, j’ai r\u00e9alis\u00e9 que les deux contrepoids Neewer respectivement de 300 et 500 grammes pouvaient \u00eatre viss\u00e9 directement sur la queue d’aronde du t\u00e9lescope sans avoir \u00e0 installer un rail suppl\u00e9mentaire. J’ai install\u00e9 le t\u00e9lescope dans le salon, viss\u00e9 les contrepoids au tube et test\u00e9 toutes les combinaisons d’accessoires, Nikon Z8, Panasonic Lumix G9, oculaires, renvoi coud\u00e9, projecteur avec G9. J’ai not\u00e9 sur la queue d’aronde les points d’\u00e9quilibre et veill\u00e9 \u00e0 ce que mon tube d\u00e9rive l\u00e9g\u00e8rement vers l’est.<\/p>\n\n\n\n

Le t\u00e9lescope est pr\u00eat, d’ailleurs samedi matin, \u00e0 6h, alors que tout le mode dormais, j’ai test\u00e9 pour la premi\u00e8re fois l’adaptateur de projection avec un oculaire 9 mm et le G9 sur la plan\u00e8te v\u00e9nus qui se levait \u00e0 l’horizon. Et \u00e7a marche !<\/p>\n\n\n\n

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

Alors non, ce n’est pas la lune, c’est bien la plan\u00e8te V\u00e9nus situ\u00e9 \u00e0 41 millions de kilom\u00e8tres. Venus pr\u00e9sente aussi des phases. <\/p>\n","protected":false},"excerpt":{"rendered":"

Le tube du t\u00e9lescope p\u00e8se plus de 6 kilos et n\u00e9cessite un contrepoids de 5,5 kilos pour l\u2019\u00e9quilibrer sur ses deux axes, d\u00e9clinaison et ascension droite. Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":9529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[],"class_list":["post-9527","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","post_format-post-format-image"],"yoast_head":"\nL'\u00e9quilibre - 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\/2023\/09\/08\/lequilibre\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L'\u00e9quilibre - Le Blog du N\u00e9oprog\" \/>\n<meta property=\"og:description\" content=\"Le tube du t\u00e9lescope p\u00e8se plus de 6 kilos et n\u00e9cessite un contrepoids de 5,5 kilos pour l\u2019\u00e9quilibrer sur ses deux axes, d\u00e9clinaison et ascension droite. 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