{"id":279,"date":"2024-10-18T01:12:20","date_gmt":"2024-10-18T01:12:20","guid":{"rendered":"https:\/\/hauslendale.com\/kyp\/articles\/?p=279"},"modified":"2024-10-18T01:12:21","modified_gmt":"2024-10-18T01:12:21","slug":"aperture-tester","status":"publish","type":"post","link":"https:\/\/hauslendale.com\/kyp\/articles\/2024\/10\/18\/aperture-tester\/","title":{"rendered":"Aperture Tester"},"content":{"rendered":"\n<table width=\"760\" border=\"0\" cellspacing=\"0\" cellpadding=\"5\" align=\"center\">\n\t\t\t<tr>\n\t\t\t\t\t<td>\n\t\t\t\t\t\t\t<p>The aperture tester simply measures the amount of light getting through \n\t\t\t\t\t\t\t\t\t\t\ta lens.<\/p>\n\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\t\t\t\tStarting with a known light intensity (our old familiar \n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/hauslendale.com\/kyp\/articles\/classics\/adjustablelight.html\">Adjustable \n\t\t\t\t\t\t\t\t\t\t\t\t\tLight Source<\/a>\n\t\t\t\t\t\t\t\t\t) at a known distance. A record is made of the resistance \n\t\t\t\t\t\t\t\t\t\t\t\t\treadings taken through a CdS cell positioned at the focal plane with the \n\t\t\t\t\t\t\t\t\t\t\t\t\tshutter held open on B or T. The resistance at each aperture is recorded. \n\t\t\t\t\t\t\t\t\t\t\t\t\tAgain, several camera\/lens combinations should be compared.\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t<p>The circuit is very simple. I used the CdS cell from a scrap Canon Canonet \n\t\t\t\t\t\t\t\t\t\t\tQL17 GIII. CdS cells are slow to react so give a few seconds between readings, \n\t\t\t\t\t\t\t\t\t\t\tespecially when going from large apertures to small ones. (for example \n\t\t\t\t\t\t\t\t\t\t\tfrom f\/1.4 to f\/16) CdS cells can be bought at Radio Shack if you don&#8217;t \n\t\t\t\t\t\t\t\t\t\t\thave any junk cameras laying around.<\/p>\n\t\t\t\t\t\t\t<p>I used 3\/32&quot; thick light baffle material on the tester surface that \n\t\t\t\t\t\t\t\t\t\t\tcontacts the cameras focal plane. All extraneous light must be blocked.<\/p>\n\t\t\t\t\t<\/td>\n\t\t\t<\/tr>\n\t<\/table>\n\t<p align=\"center\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hauslendale.com\/kyp\/articles\/classics\/images\/aperturetester.gif\" width=\"836\" height=\"535\">\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The aperture tester simply measures the amount of light getting through a lens. Starting with a known light intensity (our old familiar Adjustable Light Source ) at a known distance.&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-279","post","type-post","status-publish","format-standard","hentry","category-classic-camera-general-repair"],"_links":{"self":[{"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/posts\/279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/comments?post=279"}],"version-history":[{"count":1,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/posts\/279\/revisions"}],"predecessor-version":[{"id":280,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/posts\/279\/revisions\/280"}],"wp:attachment":[{"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/media?parent=279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/categories?post=279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hauslendale.com\/kyp\/articles\/wp-json\/wp\/v2\/tags?post=279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}