{"id":20457,"date":"2021-04-28T01:37:45","date_gmt":"2021-04-28T05:37:45","guid":{"rendered":"https:\/\/phsc.ca\/camera\/?p=20457"},"modified":"2021-04-28T03:22:50","modified_gmt":"2021-04-28T07:22:50","slug":"if-not-for-you","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/if-not-for-you\/","title":{"rendered":"if not for you …"},"content":{"rendered":"
\"\"<\/a>

Leitz 35mm f\/3.5 lens close setting stop post<\/p><\/div>\n

Toronto<\/strong>. … my lens would unscrew. Photographers know that the infinity focus setting sets the lens at its closest to the film\/sensor plane. For close-ups, the lens is extended further from the film\/sensor plane. Box cameras for film often had small lens openings relying on the physical depth of field to keep subjects over a wide range of distances more or less in focus. An of course the shorter the focal length of the lens, the wider its depth of field.<\/p>\n

At the time the tiny Leica was introduced, most lens close settings were 1 metre. More modern \u00a0film lenses come to within about 20 inches and with auxiliary lens elements, extension tubes, or a bellows, they can go even closer to the subject.<\/p>\n

As lens technology advanced, a physical stop was set to keep the lens from extending beyond the manufacturer’s design setting. For example, this mid last century 35mm Summaron lens uses a screw post to block rotation of less than 1 metre.<\/p>\n

Traditional projector lenses had no physical stop, relying on the long tube length after the threads to keep the lens from being unscrewed by accident<\/a>\u00a0and dropped. Of course modern day lenses set to auto focus keep the owner’s hands off. Even with a manual setting, most stops to focussing travel are hidden from view.<\/p>\n

Note: The post title is George Harrison’s 1970 song, sung here by Bob Dylan<\/a>. The image shown is a slightly sharpened iPod Touch photo cropped for both the 1200 pixel and 225 pixel sizes.<\/p>\n","protected":false},"excerpt":{"rendered":"

Toronto. … my lens would unscrew. Photographers know that the infinity focus setting sets the lens at its closest to the film\/sensor plane. For close-ups, the lens is extended further from the film\/sensor plane. Box cameras for film often had … 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":[3634,61,63,401,1161,3633],"class_list":["post-20457","post","type-post","status-publish","format-standard","hentry","category-history","tag-dylan","tag-leica","tag-leitz","tag-lens","tag-screw-mount","tag-stop-post"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/20457","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=20457"}],"version-history":[{"count":6,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/20457\/revisions"}],"predecessor-version":[{"id":20482,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/20457\/revisions\/20482"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=20457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=20457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=20457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}