{"id":45256,"date":"2024-04-17T08:00:40","date_gmt":"2024-04-17T08:00:40","guid":{"rendered":"https:\/\/new-blog.artlist.io\/blog\/fresnel-lights\/"},"modified":"2025-06-10T05:52:48","modified_gmt":"2025-06-10T05:52:48","slug":"lentille-fresnel","status":"publish","type":"post","link":"https:\/\/new-blog.artlist.io\/blog\/fr\/lentille-fresnel\/","title":{"rendered":"Qu&rsquo;est-ce qu&rsquo;une lentille du Fresnel et comment l&rsquo;utiliser dans vos vid\u00e9os ?"},"content":{"rendered":"\n<p>Question quiz : Qu&rsquo;ont en commun les phares, les th\u00e9\u00e2tres et les plateaux de cin\u00e9ma ? Vous avez trouv\u00e9 ? Il s&rsquo;agit de la lentille de Fresnel, parfois appel\u00e9e lanterne de Fresnel ou lampe de Fresnel. Bien qu&rsquo;elle ait \u00e9t\u00e9 initialement d\u00e9velopp\u00e9e dans les ann\u00e9es 1820 par l&rsquo;ing\u00e9nieur fran\u00e7ais Augustin Jean Fresnel pour am\u00e9liorer les phares, la lentille de Fresnel est devenue un \u00e9l\u00e9ment incontournable des industries cin\u00e9matographique et th\u00e9\u00e2trale. Elle produit une lumi\u00e8re tr\u00e8s polyvalente que vous pouvez utiliser comme spot ou comme projecteur, dans le cadre d&rsquo;un&nbsp;<a href="\&quot;https:\/\/artlist.io\/blog\/everything-you-need-to-know-about-the-3-point-lighting-setup\/\&quot;" target=\"_blank\" rel=\"noopener\">\u00e9clairage \u00e0 trois points<\/a>&nbsp;et d&rsquo;un \u00e9clairage haut et bas.<\/p>\n\n\n\n<p><em>Petit guide de prononciation : Fresnel conserve la prononciation fran\u00e7aise de son inventeur. Il se prononce donc \u00ab frey-NEL \u00bb, avec l&rsquo;accent sur la deuxi\u00e8me syllabe, et non \u00ab frezz-nul \u00bb.<\/em><\/p>\n\n\n\n<div class=\"wp-block-uagb-info-box uagb-block-5a5c3bbc uagb-infobox__content-wrap  uagb-infobox-icon-above-title uagb-infobox-image-valign-top\"><div class=\"uagb-ifb-content\"><div class=\"uagb-ifb-title-wrap\"><h2 class=\"uagb-ifb-title\">Qu&rsquo;est-ce qu&rsquo;une lentille de Fresnel ?<\/h2><\/div><p class=\"uagb-ifb-desc\">Une lentille de Fresnel se compose d&rsquo;une ampoule plac\u00e9e entre une lentille et un r\u00e9flecteur, le tout log\u00e9 dans un bo\u00eetier. La lumi\u00e8re de l&rsquo;ampoule est dirig\u00e9e vers la lentille par le r\u00e9flecteur, formant ainsi un faisceau contr\u00f4lable.<\/p><\/div><\/div>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src="\&quot;https:\/\/artlist.io\/blog\/wp-content\/uploads\/2021\/10\/31cfa13e8b4a83134e7627e72c4eeac7238ca9d2.jpg\&quot;" alt=\"fresnel light\"\ /><\/figure>\n\n\n\n<p>Une lentille de Fresnel est compos\u00e9e de plusieurs anneaux concentriques, chacun plus petit que le pr\u00e9c\u00e9dent, plut\u00f4t que d&rsquo;une lentille sph\u00e9rique classique. Chaque anneau d\u00e9vie la lumi\u00e8re un peu plus que celui situ\u00e9 en dessous, convergeant progressivement la lumi\u00e8re en un faisceau. Ces anneaux concentriques sont le fruit du travail de Fresnel pour am\u00e9liorer les lanternes des phares. La taille d&rsquo;une lentille classique aurait \u00e9t\u00e9 trop importante pour produire un faisceau de largeur et d&rsquo;intensit\u00e9 suffisantes pour \u00eatre efficace dans un phare. Cependant, les caract\u00e9ristiques de d\u00e9viation des anneaux concentriques ont chang\u00e9 la donne.<\/p>\n\n\n\n<p>La lampe, dont la puissance peut varier, et le r\u00e9flecteur sont mont\u00e9s sur un rail et peuvent \u00eatre rapproch\u00e9s ou \u00e9loign\u00e9s de la lentille de Fresnel afin d&rsquo;\u00e9largir ou de r\u00e9tr\u00e9cir le faisceau lumineux. De plus, vous pouvez fixer des&nbsp;<a href="\&quot;https:\/\/artlist.io\/blog\/the-ultimate-guide-to-light-modifiers\/\&quot;">modificateurs de lumi\u00e8re<\/a>&nbsp;\u00e0 l&rsquo;avant du bo\u00eetier, par exemple des volets, pour aider \u00e0 contr\u00f4ler le faisceau.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment utiliser une lentille de Fresnel ?<\/h2>\n\n\n\n<p>Les lentilles de Fresnel sont tr\u00e8s simples \u00e0 utiliser, ce qui en fait un excellent choix pour tous les types de d\u00e9cors, ainsi que pour l&rsquo;<a href="\&quot;https:\/\/artlist.io\/blog\/tips-for-getting-better-lighting-for-your-youtube-videos\/\&quot;" target=\"_blank\" rel=\"noopener\">l\u00e9clairage des vid\u00e9os YouTube<\/a>.<\/p>\n\n\n\n<p>Si vous rapprochez la lampe de la lentille de Fresnel, vous obtenez un \u00e9clairage plus large qui peut inonder une sc\u00e8ne. \u00c9loignez la lampe et le r\u00e9flecteur de la lentille, et le faisceau lumineux devient plus fin, vous offrant un \u00e9clairage plus cibl\u00e9. C&rsquo;est ce qui rend les lentilles de Fresnel si pratiques : vous pouvez modifier l&rsquo;angle du faisceau sans avoir \u00e0 d\u00e9placer la lampe elle-m\u00eame.<\/p>\n\n\n\n<p>Il est facile de fixer des modeleurs \u00e0 l&rsquo;avant d&rsquo;une lentille de Fresnel. Par exemple, des volets sont utilis\u00e9s pour modeler la lumi\u00e8re, des grilles pour r\u00e9duire l&rsquo;intensit\u00e9 lumineuse, des g\u00e9latines pour corriger les couleurs et des bagues d&rsquo;adaptation pour ajouter une bo\u00eete \u00e0 lumi\u00e8re.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Types de lentilles de Fresnel<\/h2>\n\n\n\n<p>Les lentilles de Fresnel se distinguent par leurs ampoules, qui ont g\u00e9n\u00e9ralement un diam\u00e8tre de 3, 6 ou 8 pouces. Ces lampes sont disponibles en diff\u00e9rentes puissances et intensit\u00e9s. Elles portent \u00e9galement des noms inhabituels, qui leur ont \u00e9t\u00e9 donn\u00e9s par Mole Richardson :<\/p>\n\n\n\n<ul>\n<li>La lentille de Fresnel de 100 watts est appel\u00e9e \u00ab inky \u00bb<\/li>\n\n\n\n<li>La lentille de Fresnel de 200 watts est appel\u00e9e \u00ab midget \u00bb<\/li>\n\n\n\n<li>La lentille de Fresnel de 650 watts est appel\u00e9e \u00ab tweenie \u00bb<\/li>\n\n\n\n<li>La lentille de Fresnel de 1 000 watts est appel\u00e9e \u00ab baby \u00bb<\/li>\n\n\n\n<li>La lentille de Fresnel de 2 000 watts est appel\u00e9e \u00ab junior \u00bb<\/li>\n\n\n\n<li>La lentille de Fresnel de 5 000 watts est appel\u00e9e \u00ab senior \u00bb<\/li>\n<\/ul>\n\n\n\n<p>Ne touchez jamais la lampe en verre d&rsquo;une lentille de Fresnel. Si vous le faites lorsqu&rsquo;elle est chaude, vous risquez de vous br\u00fbler gravement. Et si vous la touchez lorsqu&rsquo;elle est froide, votre peau peut laisser une trace d&rsquo;huile qui, lorsque la lampe chauffe, peut faire exploser le verre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c0 quoi servent les lentilles de Fresnel ?<\/h2>\n\n\n\n<p>L&rsquo;un des principaux atouts des lentilles de Fresnel r\u00e9side dans leur polyvalence. Vous pouvez les utiliser dans le cadre d&rsquo;un&nbsp;<a href="\&quot;https:\/\/artlist.io\/blog\/lighting-youtube-videos-a-beginners-guide\/\&quot;" target=\"_blank\" rel=\"noopener\">\u00e9clairage YouTube<\/a>&nbsp;pour obtenir une lumi\u00e8re douce et uniforme, ou r\u00e9duire le faisceau pour produire une&nbsp;<a href="\&quot;https:\/\/artlist.io\/blog\/hard-light-vs-soft-light\/\&quot;">lumi\u00e8re intense<\/a> et cr\u00e9er un effet dramatique.<\/p>\n\n\n\n<p>Il existe plusieurs fa\u00e7ons d&rsquo;utiliser votre projecteur Fresnel :<\/p>\n\n\n\n<ul>\n<li>Spot (ou \u00ab flood \u00bb)<\/li>\n\n\n\n<li>\u00c9clairage \u00e0 3 points<\/li>\n\n\n\n<li>\u00c9clairage high-key et low-key<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9clairage spot (ou \u00ab flood \u00bb)<\/h3>\n\n\n\n<p>Le faisceau au-dessus de l&rsquo;ouverture de cette vid\u00e9o provient d&rsquo;une lentille de Fresnel, qui agit comme un projecteur, mettant en valeur le sujet et la zone du cadre sur lesquels nous souhaitons attirer l&rsquo;attention du public.<\/p>\n\n\n\n<p><iframe src=\"https:\/\/www.youtube.com\/embed\/kghy56EsTqM?feature=oembed\" width=\"683\" height=\"384\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n\n\n\n<p>Les lentilles de Fresnel sont utilis\u00e9es comme projecteurs dans de nombreuses r\u00e9alisations th\u00e9\u00e2trales et musicales \u00e0 travers le monde :<\/p>\n\n\n\n<p>Ici, une lentille de Fresnel a \u00e9t\u00e9 utilis\u00e9e pour donner de la d\u00e9finition au sujet :<\/p>\n\n\n\n\n    <div class=\"clipsContainer\" id=\"69d07a97cf886\"><\/div>\n\n    <script>\n        jQuery(document).ready(function($) {\n\n            if(\"footage\" == 'footage') {\n                if(\"710701\" == '') { \/\/ if this is a request for multiple clips by attributes\n                    $.ajax({\n                        method: \"POST\",\n                        url: 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assetId || null,\n                                asset_type: asset_type || null,\n                                click_source: 'player',\n                                artist: artist || null,\n                                title: title || null,\n                                genre: null,\n                                ...special_data,\n                            });\n                        });\n\n                        \/\/ check screen size\n                        var mobileScreen = window.matchMedia('(max-width: 767px)');\n                        if (mobileScreen.matches) { \/\/ mobile\n                            const observer = new IntersectionObserver(function(entries) {\n                                entries.forEach(entry => {\n                                    if (entry.isIntersecting) {\n                                        player.play(); \/\/ Play the video when it enters the viewport\n                                    } else {\n                         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{\n\t\t\t\t\t\t\t\t\tclipPath\n\t\t\t\t\t\t\t\t\tclipNameForUrl\n\t\t\t\t\t\t\t\t\tid\n\t\t\t\t\t\t\t\t\tisNew\n\t\t\t\t\t\t\t\t\tfilmMakerDisplayName\n\t\t\t\t\t\t\t\t\timageUrl\n\t\t\t\t\t\t\t\t\tthumbnailUrl\n\t\t\t\t\t\t\t\t\twidth\n\t\t\t\t\t\t\t\t\tvideoUrl\n\t\t\t\t\t\t\t\t\trawFileExt\n\t\t\t\t\t\t\t\t  }\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n\t\t\t\t\t\t\t\t\"page\": 1,\n\t\t\t\t\t\t\t\t\"sortType\": 1,\n\t\t\t\t\t\t\t\t\"categoryIds\": null,\n\t\t\t\t\t\t\t\t\"searchTerm\": \"\"\n\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('footage list: ', res);\n                            var data = res.data.clipList.exactResults;\n                            if ($(\"#69d07a97cf94e\").length && data.length > 0) {\n                       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{\n\t\t\t\t\t\t\t\t\tclipPath\n\t\t\t\t\t\t\t\t\tclipNameForUrl\n\t\t\t\t\t\t\t\t\tid\n\t\t\t\t\t\t\t\t\tisNew\n\t\t\t\t\t\t\t\t\tfilmMakerDisplayName\n\t\t\t\t\t\t\t\t\timageUrl\n\t\t\t\t\t\t\t\t\tthumbnailUrl\n\t\t\t\t\t\t\t\t\twidth\n\t\t\t\t\t\t\t\t\tvideoUrl\n\t\t\t\t\t\t\t\t\trawFileExt\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n\t\t\t\t\t\t\t\t\"clipId\": 328174\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('specific footage: ', res);\n                            var data = res.data.clip;\n                            if ($(\"#69d07a97cf94e\").length && data !== '') {\n                                createClipsGrid(data, \"69d07a97cf94e\");\n                            } else if ($(\"#69d07a97cf94e\").length && data.length == '') {\n 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      isNew\n                                    artistName\n                                    thumbnailUrl\n                                    previewVideoFileUrl\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n                                \"ids\": [\"328174\"],\n                                \"page\": 1,\n                                \"take\": 1\n\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('specific template: ', res);\n                            var data = res.data.templatesByIds[0];\n                            if ($(\"#69d07a97cf94e\").length && data !== '') {\n                                createClipsGrid(data, \"69d07a97cf94e\");\n                            } else if ($(\"#69d07a97cf94e\").length && data.length == '') {\n                                $(\"#69d07a97cf94e\").empty().append('<div class=\"noClipsError\">No clips were found.<\/div>');\n                            }\n                        }\n                    });\n                }\n            }\n\n            function createClipsGrid(data, clipsContainerId){\n                const container = $(\"#\" + clipsContainerId);\n                let playerSrc = '';\n\n                $.each(data, function(index, clip) {\n                    if(\"328174\" !== '') { \/\/ if this is a request for a specific clip by id - then the data is not an array of clips but only one clip and that's why the \"clip\" variable is actually the \"data\"\n                        index = 0\n                        clip = data;\n                    }\n                    if ((index) < 1) {\n                        \/\/ clip container\n                        const clipContainer = $(\"<div>\").addClass(\"clipContainer single_clip\");\n                        \/\/ new badge\n                        if (clip.isNew) {\n                            clipContainer.append('<span class=\"isNewBadge\">NEW<\/span>');\n                        }\n                        \/\/ video\n                        let videoElement = document.createElement('video');\n                        videoElement.setAttribute('playsinline', '');\n                        videoElement.setAttribute('webkit-playsinline', '');\n                        videoElement.setAttribute('x5-playsinline', '');\n                        videoElement.setAttribute('preload', 'auto');\n                        \n                        clipContainer.append(videoElement);\n                        \/\/ clip name and artist name\n                        let clipName = '';\n                        let artistName = '';\n                        if(\"footage\" == 'footage') {\n                            clipName = clip.clipNameForUrl;\n                            clipName = clipName.replace(\/-\/g, \", 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\/\/ APPEND ALL ELEMENTS INTO AUDIO PLAYER CONTAINER\n                        clipContainer.append(videoElement, overlay);\n\n                        \/\/ if this is a preview of only one specific clip (by id)\n                        if(\"328174\" !== '') {\n                            $(container).addClass(\"clipContainerSingular\")\n                        }\n\n                        \/\/ append audio player container into main playlist container\n                        container.append(clipContainer[0]);\n\n                        if(\"footage\" == 'footage') {\n                            playerSrc =  clip.clipPath;\n                        } else if(\"footage\" == 'templates') {\n                            playerSrc =  clip.previewVideoFileUrl;\n                        }\n                        const player = videojs(videoElement, {\n                            muted: true,\n                            autoplay: true,\n                        });\n\n                        player.src({\n                            src: playerSrc,\n                            type: 'application\/x-mpegURL'\n                        });\n\n                        \/* SEGMENT EVENTS *\/\n                        const special_data = getProps();\n\n                        \/* media played *\/\n                        var $videoElement = $(videoElement);\n                        $videoElement.on('play', function() {\n                            var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n                            var assetId = clip.id;\n                            var artist = clip.filmMakerDisplayName || clip.artistName;\n                            var asset_type = null;\n                            if(\"footage\" == 'footage') {\n                                asset_type = 'footage';\n                            } else if(\"footage\" == 'templates') {\n                                asset_type = 'template';\n                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clip.id;\n                            var artist = clip.filmMakerDisplayName || clip.artistName;\n                            var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n                            var asset_type = null;\n                            if(\"footage\" == 'footage') {\n                                asset_type = 'footage';\n                            } else if(\"footage\" == 'templates') {\n                                asset_type = 'template';\n                            }\n                            analytics.track(\"media downloaded\", {\n                                asset_id: assetId || null,\n                                asset_type: asset_type || null,\n                                click_source: 'player',\n                                artist: artist || null,\n                                title: title || null,\n                                genre: null,\n                                ...special_data,\n                            });\n                        });\n\n                        \/\/ check screen size\n                        var mobileScreen = window.matchMedia('(max-width: 767px)');\n                        if (mobileScreen.matches) { \/\/ mobile\n                            const observer = new IntersectionObserver(function(entries) {\n                                entries.forEach(entry => {\n                                    if (entry.isIntersecting) {\n                                        player.play(); \/\/ Play the video when it enters the viewport\n                                    } else {\n                                        player.pause(); \/\/ Pause the video when it goes out of the viewport\n                                    }\n                                });\n                            });\n                            observer.observe(videoElement);\n                        } else { \/\/ desktop\n                           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Elle peut servir de lumi\u00e8re principale, de lumi\u00e8re d&rsquo;appoint, de <a href=\"https:\/\/artlist.io\/blog\/backlighting\/\">r\u00e9tro\u00e9clairage<\/a> ou encore pour \u00e9clairer l&rsquo;arri\u00e8re-plan de votre cadre.<\/p>\n\n\n\n<p>Ici, une lentille de Fresnel a \u00e9t\u00e9 utilis\u00e9e pour donner de la d\u00e9finition au sujet :<\/p>\n\n\n\n<p><iframe src=\"https:\/\/www.youtube.com\/embed\/9pFhdyt7qvI?start=68&amp;feature=oembed\" width=\"683\" height=\"384\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe>&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/artlist.io\/stock-footage?utm_source=blog&amp;utm_medium=sidebanner&amp;utm_campaign=fr\" target=\"_blank\" rel=\"noreferrer noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"373\" src=\"https:\/\/new-blog.artlist.io\/blog\/wp-content\/uploads\/2024\/12\/FR-Middle-Banner-get-the-best-creative-assets-for-your-videos-1140-1024x373.jpg\" alt=\"\" class=\"wp-image-35966\" srcset=\"https:\/\/new-blog.artlist.io\/blog\/wp-content\/uploads\/2024\/12\/FR-Middle-Banner-get-the-best-creative-assets-for-your-videos-1140-1024x373.jpg 1024w, https:\/\/new-blog.artlist.io\/blog\/wp-content\/uploads\/2024\/12\/FR-Middle-Banner-get-the-best-creative-assets-for-your-videos-1140-300x109.jpg 300w, https:\/\/new-blog.artlist.io\/blog\/wp-content\/uploads\/2024\/12\/FR-Middle-Banner-get-the-best-creative-assets-for-your-videos-1140-768x280.jpg 768w, https:\/\/new-blog.artlist.io\/blog\/wp-content\/uploads\/2024\/12\/FR-Middle-Banner-get-the-best-creative-assets-for-your-videos-1140.jpg 1140w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>Cette vid\u00e9o d&rsquo;archives montre comment une lentille de Fresnel peut \u00eatre utilis\u00e9e comme lumi\u00e8re principale :<\/p>\n\n\n\n\n    <div class=\"clipsContainer\" id=\"69d07a97cf9b7\"><\/div>\n\n    <script>\n        jQuery(document).ready(function($) {\n\n            if(\"footage\" == 'footage') {\n                if(\"374423\" == '') { \/\/ if this is a request for multiple clips by attributes\n                    $.ajax({\n                        method: \"POST\",\n                        url: \"https:\/\/search-api.artlist.me\/v1\/graphql\",\n                        contentType: \"application\/json\",\n                        data: JSON.stringify({\n                            query: `query ClipList($page: Int, $sortType: Int, $categoryIds: String, $searchTerm: String) {\n\t\t\t\t\t\t\t\tclipList(page: $page, sortType: $sortType, categoryIds: $categoryIds, searchTerm: $searchTerm) {\n\t\t\t\t\t\t\t\t  exactResults  {\n\t\t\t\t\t\t\t\t\tclipPath\n\t\t\t\t\t\t\t\t\tclipNameForUrl\n\t\t\t\t\t\t\t\t\tid\n\t\t\t\t\t\t\t\t\tisNew\n\t\t\t\t\t\t\t\t\tfilmMakerDisplayName\n\t\t\t\t\t\t\t\t\timageUrl\n\t\t\t\t\t\t\t\t\tthumbnailUrl\n\t\t\t\t\t\t\t\t\twidth\n\t\t\t\t\t\t\t\t\tvideoUrl\n\t\t\t\t\t\t\t\t\trawFileExt\n\t\t\t\t\t\t\t\t  }\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n\t\t\t\t\t\t\t\t\"page\": 1,\n\t\t\t\t\t\t\t\t\"sortType\": 1,\n\t\t\t\t\t\t\t\t\"categoryIds\": null,\n\t\t\t\t\t\t\t\t\"searchTerm\": \"\"\n\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('footage list: ', res);\n                            var data = res.data.clipList.exactResults;\n                            if ($(\"#69d07a97cf9b7\").length && data.length > 0) {\n                       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{\n\t\t\t\t\t\t\t\t\tclipPath\n\t\t\t\t\t\t\t\t\tclipNameForUrl\n\t\t\t\t\t\t\t\t\tid\n\t\t\t\t\t\t\t\t\tisNew\n\t\t\t\t\t\t\t\t\tfilmMakerDisplayName\n\t\t\t\t\t\t\t\t\timageUrl\n\t\t\t\t\t\t\t\t\tthumbnailUrl\n\t\t\t\t\t\t\t\t\twidth\n\t\t\t\t\t\t\t\t\tvideoUrl\n\t\t\t\t\t\t\t\t\trawFileExt\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n\t\t\t\t\t\t\t\t\"clipId\": 374423\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('specific footage: ', res);\n                            var data = res.data.clip;\n                            if ($(\"#69d07a97cf9b7\").length && data !== '') {\n                                createClipsGrid(data, \"69d07a97cf9b7\");\n                            } else if ($(\"#69d07a97cf9b7\").length && data.length == '') {\n                                $(\"#69d07a97cf9b7\").empty().append('<div class=\"noClipsError\">No clips were found.<\/div>');\n                            }\n                        }\n                    });\n                }\n            } else if(\"footage\" == 'templates') {\n                if(\"374423\" === '') {\n                    $.ajax({\n                        method: \"POST\",\n                        url: \"https:\/\/search-api.artlist.me\/v1\/graphql\",\n                        contentType: \"application\/json\",\n                        data: JSON.stringify({\n                            query: `query TemplatesList($payload: TemplatesByTermSearchPayload!) {\n                                templatesList(payload: $payload) {\n                                    nameForUrl\n                                    id\n                                    name\n                                    isNew\n                                    artistName\n                                    thumbnailUrl\n                                    previewVideoFileUrl\n                                }\n                            }`,\n                            variables: `{\n                                \"payload\": {\n                                    \"page\": 1,\n                                    \"take\": 1,\n                                    \"sortBy\": \"1\",\n                                    \"categories\": null,\n                                    \"searchTerms\": \"\"\n                                }\n                            }`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('templates list: ', res);\n                            var data = res.data.templatesList;\n                            if ($(\"#69d07a97cf9b7\").length && data.length > 0) {\n    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      isNew\n                                    artistName\n                                    thumbnailUrl\n                                    previewVideoFileUrl\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}`,\n                            variables: `{\n                                \"ids\": [\"374423\"],\n                                \"page\": 1,\n                                \"take\": 1\n\t\t\t\t\t\t\t}`,\n                        })\n                    }).done(function (res) {\n                        if(res == '') {\n                            console.log('none');\n                        } else {\n                            console.log('specific template: ', res);\n                            var data = res.data.templatesByIds[0];\n                            if ($(\"#69d07a97cf9b7\").length && data !== '') {\n                                createClipsGrid(data, \"69d07a97cf9b7\");\n                            } else if ($(\"#69d07a97cf9b7\").length && data.length == '') {\n                                $(\"#69d07a97cf9b7\").empty().append('<div class=\"noClipsError\">No clips were found.<\/div>');\n                            }\n                        }\n                    });\n                }\n            }\n\n            function createClipsGrid(data, clipsContainerId){\n                const container = $(\"#\" + clipsContainerId);\n                let playerSrc = '';\n\n                $.each(data, function(index, clip) {\n                    if(\"374423\" !== '') { \/\/ if this is a request for a specific clip by id - then the data is not an array of clips but only one clip and that's why the \"clip\" variable is actually the \"data\"\n                        index = 0\n                        clip = data;\n                    }\n                    if ((index) < 1) {\n                        \/\/ clip container\n                        const clipContainer = $(\"<div>\").addClass(\"clipContainer single_clip\");\n                        \/\/ new badge\n                        if (clip.isNew) {\n                            clipContainer.append('<span class=\"isNewBadge\">NEW<\/span>');\n                        }\n                        \/\/ video\n                        let videoElement = document.createElement('video');\n                        videoElement.setAttribute('playsinline', '');\n                        videoElement.setAttribute('webkit-playsinline', '');\n                        videoElement.setAttribute('x5-playsinline', '');\n                        videoElement.setAttribute('preload', 'auto');\n                        \n                        clipContainer.append(videoElement);\n                        \/\/ clip name and artist name\n                        let clipName = '';\n                        let artistName = '';\n                        if(\"footage\" == 'footage') {\n                            clipName = clip.clipNameForUrl;\n                            clipName = clipName.replace(\/-\/g, \", \");\n                            clipName = $(\"<a>\").addClass(\"clipName\").attr(\"href\", \"https:\/\/artlist.io\/stock-footage\/clip\/\" + clip.clipNameForUrl + \"\/\" + clip.id + \"?download=1&utm_source=blog\").attr(\"target\", \"_blank\").text(clipName);\n                            artistName = $(\"<div>\").addClass(\"artistName\").text('By ' + clip.filmMakerDisplayName + '');\n                        } else if(\"footage\" == 'templates') {\n                            clipName = $(\"<a>\").addClass(\"clipName\").attr(\"href\", \"https:\/\/artlist.io\/video-templates\/\" + clip.nameForUrl + \"\/\" + clip.id + \"?download=1&utm_source=blog\").attr(\"target\", \"_blank\").text(clip.name);\n                            artistName = $(\"<div>\").addClass(\"artistName\").text('By ' + clip.artistName + '');\n                        }\n                        const clipNames = $(\"<span>\").addClass(\"clipNames\").append(clipName, artistName);\n                        \/\/ download 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\/\/ APPEND ALL ELEMENTS INTO AUDIO PLAYER CONTAINER\n                        clipContainer.append(videoElement, overlay);\n\n                        \/\/ if this is a preview of only one specific clip (by id)\n                        if(\"374423\" !== '') {\n                            $(container).addClass(\"clipContainerSingular\")\n                        }\n\n                        \/\/ append audio player container into main playlist container\n                        container.append(clipContainer[0]);\n\n                        if(\"footage\" == 'footage') {\n                            playerSrc =  clip.clipPath;\n                        } else if(\"footage\" == 'templates') {\n                            playerSrc =  clip.previewVideoFileUrl;\n                        }\n                        const player = videojs(videoElement, {\n                            muted: true,\n                            autoplay: true,\n                        });\n\n                        player.src({\n                            src: playerSrc,\n                            type: 'application\/x-mpegURL'\n                        });\n\n                        \/* SEGMENT EVENTS *\/\n                        const special_data = getProps();\n\n                        \/* media played *\/\n                        var $videoElement = $(videoElement);\n                        $videoElement.on('play', function() {\n                            var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n                            var assetId = clip.id;\n                            var artist = clip.filmMakerDisplayName || clip.artistName;\n                            var asset_type = null;\n                            if(\"footage\" == 'footage') {\n                                asset_type = 'footage';\n                            } else if(\"footage\" == 'templates') {\n                                asset_type = 'template';\n                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asset_type = null;\n                            if(\"footage\" == 'footage') {\n                                asset_type = 'footage';\n                            } else if(\"footage\" == 'templates') {\n                                asset_type = 'template';\n                            }\n                            analytics.track(\"media paused\", {\n                                asset_id: assetId || null,\n                                asset_type: asset_type || null,\n                                click_source: 'player',\n                                artist: artist || null,\n                                title: title || null,\n                                genre: null,\n                                ...special_data,\n                            });\n                        });\n\n                        \/* media viewed *\/\n                        const observer = new IntersectionObserver(entries => {\n                            entries.forEach(entry => {\n                                if (entry.isIntersecting) {\n                                    var assetId = clip.id;\n                                    var artist = clip.filmMakerDisplayName || clip.artistName;\n                                    var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n                                    var asset_type = null;\n                                    if(\"footage\" == 'footage') {\n                                        asset_type = 'footage';\n                                    } else if(\"footage\" == 'templates') {\n                                        asset_type = 'template';\n                                    }\n                                    analytics.track(\"media viewed\", {\n                                        asset_id: assetId || null,\n                                        asset_type: asset_type || null,\n                                        click_source: 'player',\n                                        artist: artist || null,\n                                        title: title || null,\n                                        genre: null,\n                                        ...special_data,\n                                    });\n                                    observer.unobserve(entry.target);\n                                }\n                            });\n                        }, {\n                            threshold: 0.5\n                        });\n                        observer.observe($videoElement[0]);\n\n                        \/* media downloaded *\/\n                        $videoElement.closest('.clipContainer').find('.clipName').on('click', function() {\n                            var assetId = clip.id;\n                            var artist = clip.filmMakerDisplayName || clip.artistName;\n                            var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n    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clip.id;\n                            var artist = clip.filmMakerDisplayName || clip.artistName;\n                            var title = clip.clipNameForUrl ? clip.clipNameForUrl.replace(\/-\/g, \", \") : clip.name;\n                            var asset_type = null;\n                            if(\"footage\" == 'footage') {\n                                asset_type = 'footage';\n                            } else if(\"footage\" == 'templates') {\n                                asset_type = 'template';\n                            }\n                            analytics.track(\"media downloaded\", {\n                                asset_id: assetId || null,\n                                asset_type: asset_type || null,\n                                click_source: 'player',\n                                artist: artist || null,\n                                title: title || null,\n                                genre: null,\n                                ...special_data,\n                            });\n                        });\n\n                        \/\/ check screen size\n                        var mobileScreen = window.matchMedia('(max-width: 767px)');\n                        if (mobileScreen.matches) { \/\/ mobile\n                            const observer = new IntersectionObserver(function(entries) {\n                                entries.forEach(entry => {\n                                    if (entry.isIntersecting) {\n                                        player.play(); \/\/ Play the video when it enters the viewport\n                                    } else {\n                                        player.pause(); \/\/ Pause the video when it goes out of the viewport\n                                    }\n                                });\n                            });\n                            observer.observe(videoElement);\n                        } else { \/\/ desktop\n                            clipContainer.on('mouseenter', function() {\n                                player.play();\n                            });\n\n                            clipContainer.on('mouseleave', function() {\n                                player.pause();\n                            });\n                        }\n\n                    }\n                    if(\"374423\" !== '') { \/\/ if this is a request for a specific clip by id - then break out of loop after first time bc it's not an array\n                        return false;\n                    }\n                });\n            }\n\n        });\n    <\/script>\n\n    \n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u00c9clairage high-key ou low-key<\/strong><\/h3>\n\n\n\n<p>L&rsquo;\u00e9clairage high-key et low-key peuvent tous deux \u00eatre obtenus \u00e0 l&rsquo;aide d&rsquo;une lentille de Fresnel. L&rsquo;\u00e9clairage high-key r\u00e9duit le rapport d&rsquo;\u00e9clairage, ce qui r\u00e9duit le contraste entre les tons sombres et les zones plus claires. \u00c0 l&rsquo;inverse, l&rsquo;\u00e9clairage low-key cr\u00e9e un contraste plus important entre les zones sombres et claires de l&rsquo;image.<\/p>\n\n\n\n<p>Lorsque vous souhaitez obtenir un effet high key dans des prises de vue de produits, une lentille de Fresnel peut facilement inonder votre plateau.<\/p>\n\n\n\n<p>Si vous devez \u00e9clairer quelque chose de tr\u00e8s sp\u00e9cifique avec un c\u00f4ne de lumi\u00e8re intense et sans diffusion, par exemple si vous <a href=\"https:\/\/artlist.io\/blog\/night-scene-videography\/\">filmez une sc\u00e8ne de nuit<\/a>, vous trouverez peut-\u00eatre tr\u00e8s utile l&rsquo;effet d&rsquo;une lentille de Fresnel. Celle-ci diffuse beaucoup moins que une lampe \u00e0 face ouverte, ce qui vous permet un contr\u00f4le beaucoup plus pr\u00e9cis.<\/p>\n\n\n\n<p>Vous pouvez voir le faisceau ponctuel dans cette vid\u00e9o, qui a \u00e9t\u00e9 cr\u00e9\u00e9e avec une lentille de Fresnel :<\/p>\n\n\n\n<p><iframe src=\"https:\/\/www.youtube.com\/embed\/8_CyBVQHXvI?feature=oembed\" width=\"683\" height=\"384\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n\n\n\n<p>Dans cette deuxi\u00e8me vid\u00e9o, deux lentilles de Fresnels ont \u00e9t\u00e9 utilis\u00e9s pour \u00e9clairer des objets sp\u00e9cifiques dans le cadre et les mettre en valeur :<\/p>\n\n\n\n<p><iframe src=\"https:\/\/www.youtube.com\/embed\/-QClaPndzVA?start=60&amp;feature=oembed\" width=\"683\" height=\"384\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Accessoires pour lentilles de Fresnel<\/h2>\n\n\n\n<p>Il existe quelques accessoires indispensables pour travailler avec des lentilles de Fresnel :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pieds d&rsquo;\u00e9clairage<\/h3>\n\n\n\n<p>En plus de la lentille de Fresnel, votre kit devrait inclure un pied sur lequel la lampe peut \u00eatre mont\u00e9e et d\u00e9plac\u00e9e. La taille et le poids de ce pied d\u00e9pendront de la taille et du poids de votre lentille de Fresnel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gants en cuir<\/h3>\n\n\n\n<p>Saviez-vous que 70% de l&rsquo;\u00e9nergie utilis\u00e9e par une lampe de Fresnel est dispers\u00e9e sous forme de chaleur ? En d&rsquo;autres termes, elles peuvent devenir tr\u00e8s chaudes et causer de graves br\u00fblures si vous les touchez. C&rsquo;est pourquoi vous devez toujours manipuler les lentilles de Fresnel avec une bonne paire de gants en cuir r\u00e9sistants \u00e0 la chaleur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ruban adh\u00e9sif noir<\/h3>\n\n\n\n<p>Il est tr\u00e8s utile d&rsquo;en avoir sur tous les plateaux ou lieux de tournage. Si des c\u00e2bles de la lentille de Fresnel sont d\u00e9tach\u00e9s, un peu de ruban adh\u00e9sif noir peut aider \u00e0 les fixer et \u00e0 les maintenir en place rapidement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alternatives aux lentilles de Fresnel<\/h2>\n\n\n\n<p>Ce n&rsquo;est un secret pour personne que les lentilles de Fresnel peuvent \u00eatre co\u00fbteuses. Existe-t-il donc des alternatives viables aux lentilles de Fresnel ? D\u00e9couvrons les options suivantes :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampes LED<\/h3>\n\n\n\n<p>Les <a href=\"https:\/\/artlist.io\/blog\/led-video-lights\/\">lampes LED<\/a> sont de plus en plus populaires dans le domaine du cin\u00e9ma en raison de leur efficacit\u00e9 \u00e9nerg\u00e9tique, de leur polyvalence et de leur facilit\u00e9 de contr\u00f4le. Elles se pr\u00e9sentent sous diff\u00e9rentes formes, notamment des panneaux, des tubes et des panneaux lumineux, et peuvent produire une large gamme de temp\u00e9ratures de couleur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampes HMI<\/h3>\n\n\n\n<p>Les lampes HMI (Hydrargyrum Medium-arc Iodide) sont de puissantes lampes \u00e0 lumi\u00e8re du jour, couramment utilis\u00e9es pour les prises de vue en ext\u00e9rieur et \u00e0 la lumi\u00e8re du jour. Elles sont efficaces et produisent un \u00e9clairage de haute qualit\u00e9, ce qui les rend adapt\u00e9es \u00e0 la r\u00e9alisation de vid\u00e9os.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampes tungst\u00e8ne<\/h3>\n\n\n\n<p>Bien qu&rsquo;elles ne soient pas aussi efficaces sur le plan \u00e9nerg\u00e9tique que les lumi\u00e8res LED, les lumi\u00e8res tungst\u00e8ne sont encore largement utilis\u00e9es dans la r\u00e9alisation de vid\u00e9os pour leur \u00e9clairage chaleureux et naturel. Elles se pr\u00e9sentent sous diff\u00e9rentes formes, notamment des lumi\u00e8res \u00e0 face ouverte, ellipso\u00efdales et PAR.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampes fluorescentes<\/h3>\n\n\n\n<p>Les lampes fluorescentes fournissent une lumi\u00e8re douce et diffuse, souvent utilis\u00e9e pour combler les ombres ou cr\u00e9er une lumi\u00e8re principale douce. Elles sont plus froides et plus \u00e9conomes en \u00e9nergie que les lampes tungst\u00e8ne, mais peuvent n\u00e9cessiter des fixations sp\u00e9ciales pour une diffusion ad\u00e9quate.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampes douces<\/h3>\n\n\n\n<p>Les lampes douces, comme les softboxes ou les panneaux LED \u00e0 lumi\u00e8re diffuse, sont utilis\u00e9es pour cr\u00e9er une lumi\u00e8re flatteuse et uniforme qui minimise les ombres dures. Elles sont souvent utilis\u00e9es pour l&rsquo;\u00e9clairage principal ou d&rsquo;appoint en portrait et en interview.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quels sont les avantages et les inconv\u00e9nients d&rsquo;une lentille de Fresnel ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Avantages<\/h3>\n\n\n\n<ul>\n<li>Tr\u00e8s facile \u00e0 utiliser<\/li>\n\n\n\n<li>Permet de passer facilement d&rsquo;un faisceau large \u00e0 un faisceau \u00e9troit<\/li>\n\n\n\n<li>Tr\u00e8s polyvalente : peut \u00eatre utilis\u00e9e comme \u00e9clairage principal, \u00e9clairage d&rsquo;appoint, contre-jour, projecteur et pour cr\u00e9er un <a href=\"https:\/\/new-blog.artlist.io\/blog\/hard-light-vs-soft-light\/\" target=\"_blank\" rel=\"noopener\">\u00e9clairage high-key ou low-key<\/a><\/li>\n\n\n\n<li>Par rapport \u00e0 l&rsquo;\u00e9clairage ouvert, le faisceau de la lentille de Fresnel offre un meilleur contr\u00f4le et moins de diffusion de la lumi\u00e8re<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Inconv\u00e9nients<\/h3>\n\n\n\n<ul>\n<li>La lentille de Fresnel chauffe beaucoup<\/li>\n\n\n\n<li>Les nouveaux \u00e9clairages Fresnel \u00e0 LED ne g\u00e9n\u00e8rent pas autant de chaleur, mais leur couleur est souvent moins agr\u00e9able que celle des anciens mod\u00e8les \u00e0 tungst\u00e8ne. Toutefois, certains permettent \u00e9galement de contr\u00f4ler la couleur<\/li>\n\n\n\n<li>Certains des nouveaux \u00e9clairages Fresnel \u00e0 LED haute puissance peuvent produire un bruit de ventilateur<\/li>\n\n\n\n<li>Leurs prix peuvent \u00eatre \u00e9lev\u00e9s<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Une fois que vous aurez essay\u00e9 de filmer avec une lentille de Fresnel, il y a de fortes chances que vous souhaitiez toujours en avoir une avec vous. Elles peuvent \u00eatre co\u00fbteuses, mais si vous comparez leur prix \u00e0 leur polyvalence, vous constaterez qu&rsquo;elles en valent vraiment la peine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Question quiz : Qu&rsquo;ont en commun les phares, les th\u00e9\u00e2tres et les plateaux de cin\u00e9ma ? Vous avez trouv\u00e9 ? Il s&rsquo;agit de la lentille de Fresnel, parfois appel\u00e9e lanterne de Fresnel ou lampe de Fresnel. Bien qu&rsquo;elle ait \u00e9t\u00e9 initialement d\u00e9velopp\u00e9e dans les ann\u00e9es 1820 par l&rsquo;ing\u00e9nieur fran\u00e7ais Augustin Jean Fresnel pour am\u00e9liorer les [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":34524,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[716],"tags":[1402,1247,1248,1403,1404],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Lentille de Fresnel : avantages et inconv\u00e9nients<\/title>\n<meta name=\"description\" content=\"La lentille de Fresnel est une source lumineuse polyvalente et facile \u00e0 contr\u00f4ler pouvant \u00eatre utilis\u00e9e \u00e0 la fois comme spot et projecteur.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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