{"id":1600,"date":"2019-08-15T16:29:25","date_gmt":"2019-08-15T14:29:25","guid":{"rendered":"https:\/\/koustrup.com\/?page_id=1600"},"modified":"2021-10-21T12:37:47","modified_gmt":"2021-10-21T10:37:47","slug":"transmission-t-vaerdi","status":"publish","type":"page","link":"https:\/\/foto-video.dk\/?page_id=1600","title":{"rendered":"2.2.1: Transmission &#8211; T-v\u00e6rdi"},"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<p>Husk at bl\u00e6nden er et dimensionsl\u00f8st tal, derfor \u2013<\/p>\n<p>\u2022 <strong>50mm-f\/2.0 = bl\u00e6ndediameter er 25mm<\/strong><br \/>\n\u2022 <strong>100mm-f\/2.0 = bl\u00e6ndediameter er 50 mm<\/strong><\/p>\n<p>Betyder det s\u00e5 &#8211;<\/p>\n<p>Bruger vi et 50 mm objektiv ved f\/2.0 og skifter til et 100 mm objektiv kan vi ogs\u00e5 bruge f\/2.0?<\/p>\n<p>Desv\u00e6rre ikke, objektiver er forskellige og har et varierende antal glaslinser indbygget. Hver glaslinse vil absorbere noget af lyset afh\u00e6ngig af fysiske parametre og kvalitet.<\/p>\n<p>Derfor vil et objektiv (fx 50mm) fra en fabrikant have en anden transmission af lys en det samme objektiv fra en anden fabrikant (fx 50mm), s\u00e5 de to objektiver vil have forskellige lysforhold ved samme bl\u00e6nde.<\/p>\n<p>Kameraer der m\u00e5ler lys gennem objektivet (de fleste), klarer det problem og kompenserer for varierende transmission.<\/p>\n<p>Har man brug for at arbejde manuelt med skiftende objektiver (fx ved lavt lys), kan man finde indeks for de specifikke objektiver forskellige steder (bl.a. <a href=\"https:\/\/www.dxomark.com\/\">https:\/\/www.dxomark.com\/<\/a> ).<\/p>\n<p>Bruger man transmission indekset, siger man, at man arbejder med T-stops i stedet for F-stops \u2013 men ellers er \u2018spillereglerne\u2019 de samme for begge typer.<\/p>\n<p>Husk ogs\u00e5 at monterede filtre ogs\u00e5 \u00e6ndrer transmissionen af lys.<\/p>\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>Husk at bl\u00e6nden er et dimensionsl\u00f8st tal, derfor \u2013 \u2022 50mm-f\/2.0 = bl\u00e6ndediameter er 25mm \u2022 100mm-f\/2.0 = bl\u00e6ndediameter er 50 mm Betyder det s\u00e5 &#8211; Bruger vi et 50 mm objektiv ved f\/2.0 og skifter til et 100 mm objektiv kan vi ogs\u00e5 bruge f\/2.0? Desv\u00e6rre ikke, objektiver er forskellige og har et varierende [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":260,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1600","page","type-page","status-publish","hentry","post"],"_links":{"self":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1600","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=1600"}],"version-history":[{"count":4,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1600\/revisions"}],"predecessor-version":[{"id":2793,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/1600\/revisions\/2793"}],"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=1600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}