{"id":22081,"date":"2021-11-25T01:05:41","date_gmt":"2021-11-25T05:05:41","guid":{"rendered":"https:\/\/phsc.ca\/camera\/?p=22081"},"modified":"2021-11-23T23:45:00","modified_gmt":"2021-11-24T03:45:00","slug":"when-f-2-was-super-fast","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/when-f-2-was-super-fast\/","title":{"rendered":"when f\/2 was super fast"},"content":{"rendered":"
\"\"<\/a>

Screw mount Leica c1937 with Summar lens<\/p><\/div>\n

Toronto<\/strong>. In the 1930s, the films and plates were very slow by today’s standards. Normal lenses were usually around f\/3.5. To help this lack of sensitivity, Leitz designed a new lens around 1933. The 6 element lens was a modified Gauss design. With an aperture of f\/2 \u00a0wide open, the 5cm lens was a stop and a half faster than the little 4 element 5cm Elmar.<\/p>\n

The new standard lens, called “Summar”, was promoted in advertisements such as this one<\/a> on page 469 of the March, 1934 issue of American Cinematographe<\/a>r magazine. The Summar was originally a rigid lens in nickel as shown in this ad. It was changed to a collapsible nickel or chrome lens in 1934. An example of the collapsible lens is the 1937 version shown above.<\/p>\n

I snapped the Leica and Summar with my iPod Touch and cropped and adjusted it in Affinity Photo with the Focus Magic Plug-in. The advertisement is a scan courtesy of good friend, George Dunbar, himself a retired Industrial Cinematographer and Photographer who has generously shared his historical research.<\/p>\n","protected":false},"excerpt":{"rendered":"

Toronto. In the 1930s, the films and plates were very slow by today’s standards. Normal lenses were usually around f\/3.5. To help this lack of sensitivity, Leitz designed a new lens around 1933. The 6 element lens was a modified … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1944],"tags":[972,973,3943,398,61,63,401,1870],"class_list":["post-22081","post","type-post","status-publish","format-standard","hentry","category-history","tag-ad","tag-advertisement","tag-american-cinematographer","tag-camera","tag-leica","tag-leitz","tag-lens","tag-summar"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/22081","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/comments?post=22081"}],"version-history":[{"count":3,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/22081\/revisions"}],"predecessor-version":[{"id":22088,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/22081\/revisions\/22088"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=22081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=22081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=22081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}