{"id":23516,"date":"2022-06-25T01:03:45","date_gmt":"2022-06-25T05:03:45","guid":{"rendered":"https:\/\/phsc.ca\/camera\/?p=23516"},"modified":"2022-06-24T16:51:56","modified_gmt":"2022-06-24T20:51:56","slug":"transitions","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/transitions\/","title":{"rendered":"transitions"},"content":{"rendered":"<div id=\"attachment_23518\" style=\"width: 235px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/phsc.ca\/camera\/wp-content\/uploads\/2022\/06\/transition.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-23518\" class=\"wp-image-23518 size-full\" src=\"https:\/\/phsc.ca\/camera\/wp-content\/uploads\/2022\/06\/transition-sm.jpg\" alt=\"\" width=\"225\" height=\"149\" \/><\/a><p id=\"caption-attachment-23518\" class=\"wp-caption-text\">1mm ring and bayonet rear lens cap from 1960s &#8211; 70s<\/p><\/div>\n<p><strong>Toronto<\/strong>. After recovering from WW2, Leitz embarked on their famous M series bayonet mount cameras with the extremely popular<a href=\"https:\/\/www.kenrockwell.com\/leica\/m3.htm\"> M3 camera<\/a>. Like many leading manufacturers, Leitz was aware of their strong base of owners of the older\u00a0<a href=\"https:\/\/web2.ph.utexas.edu\/~yue\/misc\/LeicaLTM.html\">screw mount cameras<\/a>. They tackled the transition from screw to bayonet mount lenses and cameras in many ways.<\/p>\n<p>The last screw mount camera model, <a href=\"http:\/\/camera-wiki.org\/wiki\/Leica_IIIg\">the IIIg<\/a>\u00a0was sold alongside the M3 and introduced a few of the M3&#8217;s \u00a0features. Buyers of a Leica could buy either the M series or the IIIg.<\/p>\n<p>While the screw mount Leicas were slimmer than the slightly larger M series cameras, the film plane to lens mount distance was actually one mm longer. The 28.8mm screw mount distance became 27.8mm in the M series. This allowed a 1mm thick ring to be added to an M series camera lens mount, converting it for use with older screw mount lenses. This meant owners with screw mount lenses could use them on the newer M series cameras.<\/p>\n<p>You may have noticed that the earlier M series black Bakelite rear lens caps have three odd tabs moulded on their outer back. Did you ever wonder why? They were actually a three tab wrench! Occasionally the 1mm ring converting bayonet to screw mount got stuck on the camera. This &#8216;wrench&#8217; could make fast work \u00a0of removing the ring. Of course, if the ring was stuck to the lens, a cloth between hand and ring made short work of freeing it up.<\/p>\n<p>Also, most rings are marked with a lens focal length. The ring would lock in the correct bright line in the viewfinder of the M series camera corresponding to the chosen lens! Anyone not that fussy could use any of this line of rings to convert a screw mount lens (and some lens accessories) to bayonet mount Leicas.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Toronto. After recovering from WW2, Leitz embarked on their famous M series bayonet mount cameras with the extremely popular M3 camera. Like many leading manufacturers, Leitz was aware of their strong base of owners of the older\u00a0screw mount cameras. They &hellip; <a href=\"https:\/\/phsc.ca\/camera\/transitions\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/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":[24],"tags":[3021,398,61,401,4117,1161,4116],"class_list":["post-23516","post","type-post","status-publish","format-standard","hentry","category-camera","tag-bayonet-mount","tag-camera","tag-leica","tag-lens","tag-ltm","tag-screw-mount","tag-thread-mount"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/23516","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=23516"}],"version-history":[{"count":5,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/23516\/revisions"}],"predecessor-version":[{"id":23521,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/23516\/revisions\/23521"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=23516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=23516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=23516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}