{"id":9096,"date":"2023-05-05T08:00:00","date_gmt":"2023-05-05T06:00:00","guid":{"rendered":"http:\/\/www.blog.neoprog.eu\/?p=9096"},"modified":"2023-04-25T13:18:45","modified_gmt":"2023-04-25T11:18:45","slug":"pavel-bahtinov","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/05\/05\/pavel-bahtinov\/","title":{"rendered":"Pavel Bahtinov"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov-1024x576.jpeg\" alt=\"\" class=\"wp-image-9099\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov-1024x576.jpeg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov-300x169.jpeg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov-768x432.jpeg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov-500x281.jpeg 500w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Bahtinov.jpeg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Comment \u00e7a, vous ne connaissez pas Pavel Bahtinov ? Vous n&rsquo;avez jamais lu Guerre et Paix, Anna Kar\u00e9nine ou La Maison Russie !<\/p>\n\n\n\n<p>Bon je l&rsquo;avoue, ces ouvrages n&rsquo;ont rien \u00e0 voir avec l&rsquo;astronome russe Pavel Bahtinov. D&rsquo;ailleurs, la semaine derni\u00e8re je ne connaissais m\u00eame pas son nom.<\/p>\n\n\n\n<p>J&rsquo;ai entendu parler de lui dans un article traitant de la mise au point en photographie astronomique sur le blog <a href=\"https:\/\/astronomie-pratique.com\/mise-au-point-astrophoto\/\">Astronomie Pratique <\/a>que je vous recommande au passage. Pavel Bahtinov \u00e0 con\u00e7u un masque \u00e0 installer sur sa lunette ou son t\u00e9lescope pour faciliter la mise au point.<\/p>\n\n\n\n<p>Comment \u00e7a marche ? <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-1024x1024.jpg\" alt=\"\" class=\"wp-image-9097\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-1024x1024.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-300x300.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-150x150.jpg 150w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-768x768.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference-1536x1536.jpg 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/Laser_Interference.jpg 1950w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Si vous avez fait un peu d&rsquo;optique, vous avez probablement entendu parler des diffractions. La lumi\u00e8re \u00e9tant une onde, lorsqu&rsquo;on lui oppose des obstacles d&rsquo;une certaine taille, elle se comporte d&rsquo;\u00e9trange mani\u00e8re, cr\u00e9ant des figures g\u00e9om\u00e9triques caract\u00e9ristiques. Les diffractions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-1024x512.webp\" alt=\"\" class=\"wp-image-9098\" width=\"614\" height=\"307\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-1024x512.webp 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-300x150.webp 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-768x384.webp 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-1536x768.webp 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque-500x250.webp 500w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/masque.webp 1600w\" sizes=\"auto, (max-width: 614px) 100vw, 614px\" \/><\/figure>\n\n\n\n<p>Le masque de Bahtinov, une simple grille en plastique plac\u00e9e au sommet de votre instrument, permet de dessiner des figures qui vont vous aider \u00e0 faire la mise au point de votre instrument. Dans l&rsquo;illustration ci dessus vous pouvez voir le masque \u00e0 gauche et la figure de diffraction \u00e0 droite obtenue en pointant une \u00e9toile lorsque la mise au point est bonne.<\/p>\n\n\n\n<p>Mais je ne suis pas l\u00e0 pour plagier l&rsquo;article de Astronomie Pratique. Par contre, lorsque j&rsquo;utilise mon appareil photo au cul du t\u00e9lescope, j&rsquo;ai pas mal de difficult\u00e9 \u00e0 faire une bonne mise au point sur l&rsquo;\u00e9cran du Z6 II. Donc la m\u00e9thode du masque de Bahtinov m&rsquo;interagissait au plus au point.<\/p>\n\n\n\n<p>Sauf que, sur <a href=\"https:\/\/www.astroshop.de\/fr\/masques-de-mise-au-point\/astoptics-masque-de-bahtinov-180-de-185-mm-a-210-mm\/p,48756\">Astroshop.de<\/a>, un masque de Bahtinov pour mon instrument se vend 39,90 euros et dans l&rsquo;article il conseillait celui de <a href=\"https:\/\/azur3dprintshop.com\/65-masque-tribahtinov-c8.html\">Vincent<\/a>, r\u00e9alis\u00e9 avec une imprimante 3D, qui lui est vendu 34,90 euros. Un peu cher pour un bout de plastique.<\/p>\n\n\n\n<p>C&rsquo;est alors que j&rsquo;ai eu une illumination, si le masque pouvait \u00eatre imprim\u00e9 en 3D, il devait exister des fichiers pour le r\u00e9aliser sur la toile. Et en effet, sur Guithub vous trouvez un <a href=\"https:\/\/satakagi.github.io\/tribahtinovWebApps\/Bahtinov.html\">g\u00e9n\u00e9rateur SVG<\/a> de masque de Bahtinov et sur Mito3D vous trouvez \u00e9galement des <a href=\"https:\/\/mito3d.com\/fr\/3dmodels\/search\/MASQUE+DE+BAHTINOV\/all\/all\/latest\/1\">fichiers d&rsquo;impression<\/a>.<\/p>\n\n\n\n<p>Sauf que je n&rsquo;ai pas d&rsquo;imprimante 3D. Par contre j&rsquo;ai un fils tr\u00e8s geek qui dispose de trois imprimantes, deux \u00e0 r\u00e9sine et une \u00e0 filament et qui ne d\u00e9sire qu&rsquo;une chose, imprimer des trucs pour ses gentils parents. Il nous a d\u00e9j\u00e0 r\u00e9par\u00e9 le pommeau de douche, imprim\u00e9 un syst\u00e8me d&rsquo;irrigation pour le potager alors quand je lui ai demand\u00e9 de m&rsquo;imprimer un masque de Bahtinov en lui promettant une bi\u00e8re, il revenait \u00e0 la maison, trois heures plus tard avec un machin rond de couleur orange que j&rsquo;allais pouvoir fixer au sommet du t\u00e9lescope et deux bi\u00e8res locales pour se r\u00e9hydrader.<\/p>\n\n\n\n<p>J&rsquo;avoue, il a fallu poncer le masque pour le mettre en place, mais c&rsquo;est de ma faute, je lui avais fourni un mod\u00e8le pour un instrument dont le miroir secondaire \u00e9tait plus petit. Il va m&rsquo;en imprimer un nouveau plus adapt\u00e9.<\/p>\n\n\n\n<p>D&rsquo;apr\u00e8s mon fils, le masque a cout\u00e9 1.80 euros en mati\u00e8re plus deux heures d&rsquo;utilisation de son imprimante \u00e0 filament soit environ 0,17 euros. Allez, on va arrondir tout \u00e7a \u00e0 2 euros sans parler des deux bi\u00e8res offertes. Une tr\u00e8s bonne affaire, surtout que la bi\u00e8re \u00e9tait tr\u00e8s bonne.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-1.jpg\" alt=\"\" class=\"wp-image-9100\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-1.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-1-300x200.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-1-768x512.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-1-450x300.jpg 450w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Par contre, vu la m\u00e9t\u00e9o de ces derniers jours et celle \u00e0 venir, impossible de tester le masque, le nouvel oculaire r\u00e9ticul\u00e9 et les filtres plan\u00e9taires r\u00e9cemment achet\u00e9s. Je piaffe d&rsquo;impatience de pouvoir sortir \u00e0 nouveau le t\u00e9lescope pour r\u00e9aliser de nouvelles images de meilleur qualit\u00e9. En attendant, voici mes derniers essais qui ne demandent qu&rsquo;\u00e0 \u00eatre am\u00e9lior\u00e9s, l&rsquo;amas M 37 en haut et la galaxie M 82 en bas.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-2.jpg\" alt=\"\" class=\"wp-image-9101\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-2.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-2-300x200.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-2-768x512.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2023\/04\/astro-2-450x300.jpg 450w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Comment \u00e7a, vous ne connaissez pas Pavel Bahtinov ? Vous n&rsquo;avez jamais lu Guerre et Paix, Anna Kar\u00e9nine ou La Maison Russie ! <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2023\/05\/05\/pavel-bahtinov\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":9099,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,2812,2813,1641,1117,2811],"class_list":["post-9096","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-diffractions","tag-impression-3d","tag-masque","tag-mise-au-point","tag-pavel-bahtinov","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>Pavel Bahtinov - Le Blog du N\u00e9oprog<\/title>\n<meta name=\"description\" content=\"Comment \u00e7a, vous ne connaissez pas Pavel Bahtinov ? 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