{"id":1574,"date":"2019-08-12T14:03:22","date_gmt":"2019-08-12T12:03:22","guid":{"rendered":"https:\/\/koustrup.com\/?page_id=1574"},"modified":"2021-10-21T13:08:05","modified_gmt":"2021-10-21T11:08:05","slug":"blaendeaabningens-areal","status":"publish","type":"page","link":"https:\/\/foto-video.dk\/?page_id=1574","title":{"rendered":"2.2.2: Bl\u00e6nde\u00e5bningens areal og lysm\u00e6ngde"},"content":{"rendered":"<nav aria-label=\"breadcrumbs\">\n            <div class=\"breadcrumb-container theme1\">\n                <ol>\n                    <li><a title=\"Du er her\" href=\"#\"><span>Du er her<\/span><\/a><span class=\"separator\">&gt;&gt;<\/span><\/li>\n                    <\/ol>\n            <\/div>\n        <\/nav>    <script type=\"application\/ld+json\">\n        {\n            \"@context\": \"http:\/\/schema.org\",\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                 {\n                            \"@type\": \"ListItem\",\n                            \"position\": 1,\n                            \"item\": {\n                                \"@id\": \"#\",\n                                \"name\": \"Du er her\"\n                            }\n                        }\n                                                    ]\n        }\n    <\/script>\n   \n    <script>\n            <\/script>\n\n<hr \/>\n<table style=\"width: 100%; float: center; border: 0; padding: 5px; margin-right: auto; margin-left: auto;\">\n<tbody>\n<tr>\n<td style=\"text-align: left; vertical-align: top; width: 60%; border: 0; padding: 5px;\"><img decoding=\"async\" class=\"alignleft wp-image-2794 size-full\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden10.png\" alt=\"\" width=\"977\" height=\"638\" srcset=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden10.png 977w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden10-300x196.png 300w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden10-768x502.png 768w\" sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0; padding: 5px;\"><strong>Bl\u00e6ndetallet er defineret som<\/strong> &#8211;<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-2797 size-medium\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden11-300x54.png\" alt=\"\" width=\"300\" height=\"54\" srcset=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden11-300x54.png 300w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden11.png 611w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Det vil sige, at jo st\u00f8rre bl\u00e6nde\u00e5bning &#8211; jo mindre bl\u00e6nde. Anvender vi ligningen for EV(bl\u00e6nde, lukker) og afs\u00e6tter behovet for lys til sensoren (m\u00e5lt i EV) som en funktion af bl\u00e6nden med en konstant lukkerhastighed, f\u00e5r vi et diagram som det til venstre.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Diagrammet viser, at jo mindre bl\u00e6nde &#8211; jo mindre lys er der behov for.<br \/>\nDet betyder, at arealet af bl\u00e6nde\u00e5bningen styrer, hvor meget lys der kommer igennem til sensoren.<\/p>\n<hr \/>\n<table style=\"width: 100%; float: center; border: 0; padding: 5px; margin-right: auto; margin-left: auto;\">\n<tbody>\n<tr>\n<td style=\"text-align: left; vertical-align: top; width: 70%; border: 0; padding: 2px;\"><strong>Areal af en cirkel (bl\u00e6nde\u00e5bningen) er defineret som &#8211;<\/strong><br \/>\n<img decoding=\"async\" class=\"alignnone wp-image-2801\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden12-150x61.png\" alt=\"\" width=\"75\" height=\"24\" \/><br \/>\neller<br \/>\n<img decoding=\"async\" class=\"alignnone wp-image-2802\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaenden13.png\" alt=\"\" width=\"128\" height=\"46\" \/><br \/>\n<strong>Diameteren D = 2r, eller radius r = D\/2; <\/strong><strong>Hvordan fordobler (halverer) vi s\u00e5 lysm\u00e6ngden?<\/strong><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0; padding: 2px;\"><img decoding=\"async\" class=\"aligncenter wp-image-2803\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/cirkel-med-centrum-radius-og-periferi-18.png\" alt=\"\" width=\"200\" height=\"207\" srcset=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/cirkel-med-centrum-radius-og-periferi-18.png 495w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/cirkel-med-centrum-radius-og-periferi-18-290x300.png 290w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: middle; border: 0; padding: 2px;\" colspan=\"2\"><img decoding=\"async\" class=\"wp-image-2806 alignnone\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaendeareal1-1024x736-1.png\" alt=\"\" width=\"800\" height=\"575\" srcset=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaendeareal1-1024x736-1.png 1024w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaendeareal1-1024x736-1-300x216.png 300w, https:\/\/foto-video.dk\/wp-content\/uploads\/2021\/10\/blaendeareal1-1024x736-1-768x552.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<p style=\"text-align: right;\"><a href=\"https:\/\/foto-video.dk\/?page_id=260\"><strong>Retur til bl\u00e6nden &gt;&gt;<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bl\u00e6ndetallet er defineret som &#8211; Det vil sige, at jo st\u00f8rre bl\u00e6nde\u00e5bning &#8211; jo mindre bl\u00e6nde. Anvender vi ligningen for EV(bl\u00e6nde, lukker) og afs\u00e6tter behovet for lys til sensoren (m\u00e5lt i EV) som en funktion af bl\u00e6nden med en konstant lukkerhastighed, f\u00e5r vi et diagram som det til venstre. Diagrammet viser, at jo mindre bl\u00e6nde [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":260,"menu_order":20,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1574","page","type-page","status-publish","hentry","post"],"_links":{"self":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1574"}],"version-history":[{"count":13,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1574\/revisions"}],"predecessor-version":[{"id":2809,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1574\/revisions\/2809"}],"up":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/260"}],"wp:attachment":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}