{"id":11469,"date":"2025-04-23T08:00:00","date_gmt":"2025-04-23T06:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=11469"},"modified":"2025-04-18T15:44:06","modified_gmt":"2025-04-18T13:44:06","slug":"avec-ou-sans-filtre","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2025\/04\/23\/avec-ou-sans-filtre\/","title":{"rendered":"Avec ou sans filtre ?"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Ma m\u00e8re fumait des Dunhill rouges, mon p\u00e8re des Gauloises sans filtre, mon fr\u00e8re a\u00een\u00e9 roulait ses cigarettes, le second crapotait des menthol\u00e9es, le troisi\u00e8me des joints et moi je fumais la pipe. Certains affirment que les filtres sont pleins de produits chimiques toxiques, d\u2019autres que ce bout jaun\u00e2tre limite les d\u00e9g\u00e2ts. Dans tous les cas, il vaut mieux ne pas fumer.<\/p>\n\n\n\n

J\u2019ai commenc\u00e9 \u00e0 photographier sans filtre mais pas \u00e0 l\u2019aide d\u2019un capteur d\u00e9filtr\u00e9. Puis j\u2019ai utilis\u00e9 une cam\u00e9ra et aujourd\u2019hui je me lance dans l\u2019utilisation des filtres. <\/p>\n\n\n\n

Mais tout doucement. Car un filtre absorbe une partie non n\u00e9gligeable de la lumi\u00e8re et lorsque l\u2019on scrute le vide intersid\u00e9ral, on trouve peu de lumi\u00e8re. En plus j\u2019utilise une cam\u00e9ra couleur alors que d\u2019ordinaire la photographie astronomique se fait avec des cam\u00e9ras noir et blanc et plusieurs filtres comme le O3, H Alfa ou SO2. Mais ce genre de clich\u00e9 demande trois fois \u00e0 quatre fois plus d\u2019images, c\u2019est \u00e0 dire plusieurs nuits de photographie. <\/p>\n\n\n\n

Je n’en suis pas l\u00e0. Pour l\u2019instant je vais juste essayer d\u2019enlever les rayonnements parasites comme les \u00e9clairages urbains et la pollution de mes images. Donc je ne vais utiliser qu\u2019un seul filtre pendant toute ma session photo.<\/p>\n\n\n\n

Les filtres, que ce soit en photographie ou en astronomie, cela co\u00fbte un bras. Alors pour commencer, j\u2019ai \u00e9t\u00e9 raisonnable, j\u2019ai command\u00e9 un UV-IR cut et un tri band. L\u2019UV-IR cut filtre comme son nom l\u2019indique le rayonnement ultraviolet et infrarouge. Le tri band lui ne laisse passer que trois bandes assez \u00e9troites du spectre lumineux, le rayonnement \u00e9mis par l\u2019oxyg\u00e8ne, le souffre et l\u2019hydrog\u00e8ne. <\/p>\n\n\n\n

Mais qui dit filtre dit porte filtre. Encore un machin \u00e0 placer entre la lunette et la cam\u00e9ra. Il y a des portes filtres encombrants et relativement chers pilot\u00e9s par ordinateur et puis il y a des petits trucs accessibles mais totalement manuels. J\u2019ai opt\u00e9 pour un compromis avec le SVBONY. Il poss\u00e8de un tiroir aimant\u00e9e qui permet de changer facilement de filtre ou de ne rien mettre \u00e0 la place.<\/p>\n\n\n\n

Le hic c\u2019est qu\u2019il fait 21 mm ce qui m\u2019oblige \u00e0 revoir tout le r\u00e9glage du bac focus<\/a>, c\u2019est \u00e0 dire la distance qui s\u00e9pare le r\u00e9ducteur de champ de la cam\u00e9ra. Celui-ci est de 55 mm et celui de la cam\u00e9ra est de 6.5 mm ce qui me laissait 27.5 mm \u00e0 combler sachant que la cam\u00e9ra dispose d\u2019une bague de 11 mm soit donc 16.5 mm \u00e0 compenser.<\/p>\n\n\n\n

J\u2019ai enlev\u00e9 le rotateur de champ situ\u00e9 derri\u00e8re le r\u00e9ducteur pour le placer juste derri\u00e8re le porte oculaire et j\u2019ai gliss\u00e9 deux bagues, une de 12 et une autre de 5 mm pour atteindre le bon bac focus. Des op\u00e9rations contr\u00f4l\u00e9es au pied \u00e0 coulisse pour \u00eatre certain de ne pas avoir de mauvaises surprises.<\/p>\n\n\n\n

Il ne reste plus qu\u2019\u00e0 essayer tout cela d\u00e8s que le ciel daignera se d\u00e9gager. Normalement le filtre tri band devrait am\u00e9liorer les images de n\u00e9buleuses en ville et le UV-IR cut mes photos plan\u00e9taires et de galaxies.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ma m\u00e8re fumait des Dunhill rouges, mon p\u00e8re des Gauloises sans filtre, mon fr\u00e8re a\u00een\u00e9 roulait ses cigarettes, le second crapotait des menthol\u00e9es, le troisi\u00e8me des joints et moi je fumais la pipe. Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":11470,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,1162,875],"class_list":["post-11469","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-filtres","tag-photographie","post_format-post-format-image"],"yoast_head":"\nAvec ou sans filtre ? - 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\/2025\/04\/23\/avec-ou-sans-filtre\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Avec ou sans filtre ? - Le Blog du N\u00e9oprog\" \/>\n<meta property=\"og:description\" content=\"Ma m\u00e8re fumait des Dunhill rouges, mon p\u00e8re des Gauloises sans filtre, mon fr\u00e8re a\u00een\u00e9 roulait ses cigarettes, le second crapotait des menthol\u00e9es, le troisi\u00e8me des joints et moi je fumais la pipe. 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