{"id":8435,"date":"2007-05-31T12:35:57","date_gmt":"2007-05-31T12:35:57","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/m13-au-cn212\/"},"modified":"2025-06-14T19:21:11","modified_gmt":"2025-06-14T17:21:11","slug":"m13-au-cn212","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/m13-au-cn212\/","title":{"rendered":"M13 au CN212"},"content":{"rendered":"

Auteur: Alain Schmitz (schmitz_a@swing.be)<\/p>\n

Bonjour \u00e0 tous,<\/p>\n

Pour casser le temps mort li\u00e9 \u00e0 la m\u00e9t\u00e9o, voici un clich\u00e9 du plus c\u00e9l\u00e8bre amas globulaire du ciel bor\u00e9al, celui de la constellation d’Hercule (M13). Cette photo prise ce mardi 29 mai 2007 \u00e0 l’aide du Canon 300D au foyer du CN212 en configuration Newton est le r\u00e9sultat d’une addition de 5 prises de 3 minutes (corrections noir et PLU incluses).<\/p>\n

Objet facile s’il en est, le but \u00e9tait de tester la qualit\u00e9 du correcteur de coma de chez Televue, le fameux PARACORR, au foyer du CN212 en configuration Newton ouvert \u00e0 f4. J’\u00e9tais en effet assez d\u00e9\u00e7u du correcteur TAKAHASHI livr\u00e9 d’origine avec l’instrument optique qui ne corrige que tr\u00e8s partiellement la coma sur le format d’un APN classique.
\nIl s’av\u00e8re que le PARACORR s’affranchit particuli\u00e8rement bien de sa mission, en ne d\u00e9gradant pratiquement pas le piqu\u00e9 des \u00e9toiles au centre du champ, comme cela semble \u00eatre le cas pour des correcteurs de type ROSS bas\u00e9s sur des doublets optiques qui induisent une aberration de sph\u00e9ricit\u00e9 appr\u00e9ciable. Pour ce qui concerne le vignettage, il ne d\u00e9passe pas 15% et se corrige ais\u00e9ment \u00e0 l’aide d’une bonne PLU.<\/p>\n

\"\"<\/a><\/p>\n

A+,<\/p>\n

Alain SCHMITZ<\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

Auteur: Alain Schmitz (schmitz_a@swing.be) Bonjour \u00e0 tous, Pour casser le temps mort li\u00e9 \u00e0 la m\u00e9t\u00e9o, voici un clich\u00e9 du plus c\u00e9l\u00e8bre amas globulaire du ciel bor\u00e9al, celui de la constellation d’Hercule (M13). Cette photo prise ce mardi 29 mai 2007 \u00e0 l’aide du Canon 300D au foyer du CN212 en configuration Newton est le […]<\/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-8435","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8435","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=8435"}],"version-history":[{"count":3,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8435\/revisions"}],"predecessor-version":[{"id":14919,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8435\/revisions\/14919"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}