{"id":268,"date":"2023-06-29T09:51:08","date_gmt":"2023-06-29T07:51:08","guid":{"rendered":"https:\/\/pat-acc.net\/?page_id=268"},"modified":"2023-11-24T14:09:00","modified_gmt":"2023-11-24T13:09:00","slug":"optique-guide-pratique","status":"publish","type":"page","link":"https:\/\/pat-acc.com\/fr\/optique-guide-pratique\/","title":{"rendered":"Optique : guide pratique"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.23.1&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bb#E02B20&Prime; use_background_color_gradient=\u00a0\u00bbon\u00a0\u00bb background_color_gradient_stops=\u00a0\u00bbrgba(0,0,0,0.71) 0%|rgba(0,0,0,0.5) 99%\u00a0\u00bb background_color_gradient_overlays_image=\u00a0\u00bbon\u00a0\u00bb background_image=\u00a0\u00bbhttps:\/\/pat-acc.net\/wp-content\/uploads\/2023\/11\/Bandeau-optiques-Guide-pratique.png\u00a0\u00bb parallax=\u00a0\u00bbon\u00a0\u00bb background_blend=\u00a0\u00bbdarken\u00a0\u00bb custom_padding=\u00a0\u00bb79px||152px|||\u00a0\u00bb hover_enabled=\u00a0\u00bb0&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb custom_padding_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb sticky_enabled=\u00a0\u00bb0&Prime; custom_padding_phone=\u00a0\u00bb35px||35px||false|false\u00a0\u00bb custom_padding_tablet=\u00a0\u00bb79px||152px|||\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb max_width=\u00a0\u00bb80%\u00a0\u00bb custom_padding=\u00a0\u00bb140px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb header_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_text_color=\u00a0\u00bb#FFFFFF\u00a0\u00bb header_font_size=\u00a0\u00bb55px\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#bf0029&Prime; header_2_line_height=\u00a0\u00bb1.9em\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h1 class=\"has-text-align-center has-blanc-color has-text-color\" id=\"optique-guide-pratique\">Optique : guide pratique<\/h1>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb||8px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb||6px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||67px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2 class=\"has-text-align-center\" id=\"les-cibles-de-calage-pret-a-tourner\">Les cibles de calage Pr\u00eat \u00c0 Tourner<\/h2>\n<div class=\"wp-container-3 wp-block-group\">\n<div class=\"wp-block-group__inner-container\">\n<p>Les cibles utilis\u00e9es par Pr\u00eat \u00c0 Tourner pour ses mires ont une histoire et une explication math\u00e9matique tr\u00e8s pr\u00e9cise. Il faut remonter au milieu du XIX\u00e8 si\u00e8cle pour voir leur premi\u00e8re apparition gr\u00e2ce aux travaux de L\u00e9on Foucault. Aujourd&rsquo;hui, P.A.T. reprend ce codage de p\u00e9riodes de traits et le d\u00e9mocratise pour vous offrir les meilleurs outils techniques pour le calage de vos optiques et capteurs avec un maximum de simplicit\u00e9.<\/p>\n<p>L\u00e9on Foucault (1819-1868), \u00e9minent physicien et astronome fran\u00e7ais (\u00e0 qui l\u2019on doit entre autres l\u2019invention du gyroscope, la d\u00e9termination de la vitesse de la lumi\u00e8re, ou encore la d\u00e9monstration de la rotation de la Terre par la c\u00e9l\u00e8bre exp\u00e9rience dite du Pendule de Foucault) tourna ses premi\u00e8res recherches vers la photographie, puis plus tard vers des questions les plus \u00e9lev\u00e9es de la th\u00e9orie de la lumi\u00e8re. \u00c0 dessein d\u2019am\u00e9liorer la pr\u00e9cision de ses instruments astronomiques, il utilisa ce qu\u2019il appelait des \u00ab mires d\u2019\u00e9preuve \u00bb, outils dont il a toujours fait un usage singulier, sans penser \u00e0 les faire r\u00e9f\u00e9rencer de quelle que mani\u00e8re que ce fut. Supposant probablement que cela n\u2019int\u00e9resserait personne. Il y est tout de m\u00eame fait allusion dans le Recueil des travaux scientifiques de L\u00e9on Foucault, ouvrage posthume datant de 1878, notamment dans le chapitre \u00ab M\u00e9moire sur la construction des t\u00e9lescopes en verre argent\u00e9 \u00bb.<\/p>\n<p><em>Texte issu des recherches effectu\u00e9es par Aur\u00e9lien Dubois, chef op\u00e9rateur.<\/em><\/p>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bb#f9f9f9&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb11px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||8px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2 style=\"text-align: center;\">L\u00e9on Foucault (1819-1868)<\/h2>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb2_5,3_5&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb2_5&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/pat-acc.net\/wp-content\/uploads\/2023\/06\/receuil_leon_foucault.jpg\u00a0\u00bb title_text=\u00a0\u00bbreceuil_leon_foucault\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_image src=\u00a0\u00bbhttps:\/\/pat-acc.net\/wp-content\/uploads\/2023\/06\/Leon-Foucault.jpg\u00a0\u00bb title_text=\u00a0\u00bbLeon-Foucault\u00a0\u00bb align=\u00a0\u00bbcenter\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_margin=\u00a0\u00bb72px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][\/et_pb_column][et_pb_column type=\u00a0\u00bb3_5&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||28px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]\u00ab Mais pour juger s\u00fbrement du r\u00e9sultat, et pour donner une expression moins vague que celle qu\u2019on emprunte habituellement au langage ordinaire, il convient de diriger le miroir mont\u00e9 en t\u00e9lescope newtonien vers une mire lointaine, syst\u00e9matiquement compos\u00e9e de mani\u00e8re \u00e0 offrir \u00e0 l\u2019observation des d\u00e9tails plac\u00e9s \u00e0 la limite de la visibilit\u00e9. On construit ces mires d\u2019\u00e9preuves en tra\u00e7ant sur une lame d\u2019ivoire des s\u00e9ries de divisions partag\u00e9es en groupes successifs o\u00f9 le millim\u00e8tre est fractionn\u00e9 en parties de plus en plus petites. La largeur du trait doit varier d\u2019un groupe \u00e0 un autre en proportion telle, que dans chacun d\u2019eux les espaces noircis aient la m\u00eame \u00e9tendue que l\u2019intervalle qui les s\u00e9pare (fig. 18). Quand on consid\u00e8re \u00e0 l\u2019\u0153il nu une pareille mire plac\u00e9e \u00e0 distance ou qu\u2019on l\u2019observe avec un instrument trop faible, les diff\u00e9rents groupes pr\u00e9sentent une teinte grise uniforme. Mais si l\u2019on diminue la distance ou si l\u2019on prend des instruments plus puissants, on voit les groupes de divisions les plus \u00e9cart\u00e9es se r\u00e9soudre en traits distincts, tandis que les autres restent confondus. En augmentant le grossissement, et en \u00e9clairant suffisamment la mire, on s\u2019assure que dans les groupes qui demeurent uniform\u00e9ment gris, la confusion des traits n\u2019est pas imputable \u00e0 l\u2019impuissance de l\u2019\u0153il ; elle est donc \u00e0 mettre tout enti\u00e8re sur le compte de l\u2019instrument qui r\u00e9sout l\u2019un des groupes et ne r\u00e9sout pas le suivant. En constatant ainsi quel est le groupe dont les divisions se trouvent par leur rapprochement, plac\u00e9s \u00e0 la limite de visibilit\u00e9, on acquiert la preuve positive que l\u2019instrument s\u00e9pare les parties \u00e9cart\u00e9es par un certain espace angulaire, et ne s\u00e9pare pas celles qui sont plus rapproch\u00e9es les unes des autres. Il suit de l\u00e0 que l\u2019aptitude de l\u2019instrument \u00e0 p\u00e9n\u00e9trer les d\u00e9tails des objets observ\u00e9s, ou ce qu\u2019on peut appeler son pouvoir optique, est inversement proportionnel \u00e0 l\u2019angle limite de s\u00e9parabilit\u00e9 de divisions contigu\u00ebs : il a, en d\u00e9finitive, pour expression le quotient de la distance de la mire par l\u2019intervalle moyen des derni\u00e8res parties distinctes \u00bb.[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||8px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2>Guillaume Bigourdan (1851-1932)<\/h2>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb40px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||8px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p>Il est \u00e0 noter l\u2019amendement de cet outil par Guillaume Bigourdan (1851-1932) autre brillant astronome fran\u00e7ais, par la repr\u00e9sentation de ces m\u00eames motifs, inclin\u00e9s de 45\u00b0 ce qui permet de mettre en \u00e9vidence un \u00e9ventuel probl\u00e8me d\u2019astigmatisme. Le scientifique a consid\u00e9rablement r\u00e9pandu l\u2019utilisation des mires ainsi repr\u00e9sent\u00e9es.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/pat-acc.net\/wp-content\/uploads\/2023\/06\/Guillaume-bigourdan.jpg\u00a0\u00bb title_text=\u00a0\u00bbGuillaume-bigourdan\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p>De prime abord, la mire de L\u00e9on Foucault d&rsquo;apr\u00e8s Guillaume Bigourdan n&rsquo;est pas une mire d\u00e9di\u00e9e au cin\u00e9ma ou aux essais cam\u00e9ra. Elle permet de caract\u00e9riser l&rsquo;acuit\u00e9 visuelle du seul appareil optique propre \u00e0 chaque utilisateur : l&rsquo;\u0153il humain. Et ce, d&rsquo;un objet vu \u00e0 10 m\u00e8tres.<\/p>\n<p>La premi\u00e8re explication des mires par G. Bigourdan \u00e9tait la suivante :<\/p>\n<blockquote>\n<p><strong>\u00ab Les num\u00e9ros expriment, en vingti\u00e8mes de millim\u00e8tres, la distance des axes de deux traits noirs (ou de deux traits blancs) cons\u00e9cutifs. Ils expriment ainsi, en secondes d&rsquo;arc, la distance angulaire de ces axes \u00e0 10 m\u00e8tres \u00bb.<\/strong><\/p>\n<\/blockquote>\n<p>Le degr\u00e9 (\u00b0) est l&rsquo;unit\u00e9 de base pour mesurer un angle. Un angle droit fait 90\u00b0, un tour complet fait 360\u00b0. Un angle de 1\u00b0 peut ensuite se subdiviser en sous-unit\u00e9s. Un degr\u00e9 est ainsi constitu\u00e9 de 60 minutes d&rsquo;arc, chacune divis\u00e9e en 60 secondes d&rsquo;arc. Une minute d&rsquo;arc est donc \u00e9gale \u00e0 1\/60 degr\u00e9, soit 0.0166\u00b0, et une seconde d&rsquo;arc \u00e0 1\/3600 degr\u00e9.<\/p>\n<p>En pratique pour des essais cam\u00e9ra, m\u00eame si la num\u00e9rotation d&rsquo;une mire P.A.T. a \u00e9t\u00e9 con\u00e7ue pour mesurer l&rsquo;acuit\u00e9 de l&rsquo;\u0153il humain \u00e0 une distance de 10 m\u00e8tres, cela n&#8217;emp\u00eache en rien son utilisation pour une v\u00e9rification de calage et de d\u00e9finition avec n&rsquo;importe quel syst\u00e8me de prise de vue et \u00e0 n&rsquo;importe quelle distance.<\/p>\n<p>P.A.T. a donc d\u00e9cid\u00e9 de simplifier cette explication technique bas\u00e9e sur les secondes d&rsquo;arc, certes tr\u00e8s utile dans de nombreux cas de tests optiques, mais peut-\u00eatre un peu complexe dans la majeure partie des utilisations.<\/p>\n<p>L&rsquo;explication des nombres est donc la suivante :<\/p>\n<blockquote>\n<p><strong>\u00ab Les num\u00e9ros des cibles expriment, en vingti\u00e8mes de millim\u00e8tre, le nombre de paires de lignes imprim\u00e9es sur 1 millim\u00e8tre \u00bb.<\/strong><\/p>\n<\/blockquote>\n<p>Le degr\u00e9 de nettet\u00e9 d\u00e9pendra de la clart\u00e9 entre les lignes noires. Le pouvoir de r\u00e9solution d\u00e9pendra du nombre de lignes vues.<\/p>\n<p>Afin de vous aider \u00e0 utiliser au mieux cette p\u00e9riode de cibles, P.A.T. met \u00e0 votre disposition un tableau de corr\u00e9lation dans lequel est indiqu\u00e9e la correspondance entre : num\u00e9ro sur la mire, paires de lignes \/ mm imprim\u00e9es sur la mire, paires de lignes \/ mm imprim\u00e9es sur votre capteur \u00e0 une distance de test \u00e9gale \u00e0 50 fois la focale.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bb#f9f9f9&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb20px\u00a0\u00bb text_line_height=\u00a0\u00bb2.2em\u00a0\u00bb ul_line_height=\u00a0\u00bb2.2em\u00a0\u00bb header_2_text_align=\u00a0\u00bbcenter\u00a0\u00bb header_2_text_color=\u00a0\u00bb#be042c\u00a0\u00bb header_2_font_size=\u00a0\u00bb42px\u00a0\u00bb header_2_line_height=\u00a0\u00bb2.6em\u00a0\u00bb custom_margin=\u00a0\u00bb||8px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2 id=\"tableau-de-correspondance\">Tableau de correspondance<\/h2>\n<p>Pr\u00eat \u00c0 Tourner met \u00e0 votre disposition le tableau de correspondance vous permettant d&rsquo;interpr\u00e9ter les num\u00e9ros des cibles.<\/p>\n<p class=\"has-text-align-center\"><em>En filmant la mire \u00e0 50 fois la distance focale. <\/em><\/p>\n<p>[\/et_pb_text][et_pb_code _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_code][et_pb_code _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bb#FFFFFF\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<tbody>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"><strong>Chart number<\/strong><\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"><strong>Pairs of lines \/ mm on the chart<\/strong><\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"><strong>Pairs of lines \/ mm on the sensor<\/strong><\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">4<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">250<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">4<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">200<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">6<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">3,333<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">166,667<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">7<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">2,857<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">142,857<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">8<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">2,5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">125<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">9<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">2,222<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">111,111<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">10<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">2<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">100<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">11<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,818<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">90,909<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">12<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,666<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">83,333<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">13<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,538<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">76,923<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">14<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,429<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">71,429<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">15<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,333<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">66,666<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">16<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,25<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">62,5<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">17<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,176<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">58,824<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">18<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,111<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">55,555<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">19<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1,053<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">52,632<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">20<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">1<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">50<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">21<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,952<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">47,619<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">22<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,909<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">45,455<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">23<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,87<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">43,478<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">24<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,833<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">41,666<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">25<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,8<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">40<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">26<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,769<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">38,462<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">27<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,741<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">37,037<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">28<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,714<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">35,714<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">29<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,69<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">34,483<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">30<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,666<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">33,333<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">31<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,645<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">32,258<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">32<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,625<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">31,25<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">33<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,606<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">30,303<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">34<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,589<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">29,412<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">35<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,571<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">28,571<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">36<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,555<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">27,777<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">37<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,541<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">27,027<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">38<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,526<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">26,316<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">39<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,513<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">25,641<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">40<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">25<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">41<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,488<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">24,39<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">42<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,476<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">23,81<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">43<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,465<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">23,256<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">44<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,455<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">22,727<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">45<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,444<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">22,222<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">46<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,435<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">21,739<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">47<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,426<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">21,277<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">48<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,417<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">20,833<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">49<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,408<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">20,408<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">50<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,4<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">20<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\">55<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">0,364<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\">18,182<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Optique : guide pratiqueLes cibles de calage Pr\u00eat \u00c0 Tourner Les cibles utilis\u00e9es par Pr\u00eat \u00c0 Tourner pour ses mires ont une histoire et une explication math\u00e9matique tr\u00e8s pr\u00e9cise. Il faut remonter au milieu du XIX\u00e8 si\u00e8cle pour voir leur premi\u00e8re apparition gr\u00e2ce aux travaux de L\u00e9on Foucault. Aujourd&rsquo;hui, P.A.T. reprend ce codage de p\u00e9riodes [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-268","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Optique : guide pratique - Pr\u00eat \u00e0 tourner<\/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:\/\/pat-acc.com\/fr\/optique-guide-pratique\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optique : guide pratique - Pr\u00eat \u00e0 tourner\" \/>\n<meta property=\"og:description\" content=\"Optique : guide pratiqueLes cibles de calage Pr\u00eat \u00c0 Tourner Les cibles utilis\u00e9es par Pr\u00eat \u00c0 Tourner pour ses mires ont une histoire et une explication math\u00e9matique tr\u00e8s pr\u00e9cise. 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