{"id":26791,"date":"2023-09-07T01:03:22","date_gmt":"2023-09-07T05:03:22","guid":{"rendered":"https:\/\/phsc.ca\/camera\/?p=26791"},"modified":"2023-09-06T00:10:41","modified_gmt":"2023-09-06T04:10:41","slug":"beyond-macro","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/beyond-macro\/","title":{"rendered":"beyond macro"},"content":{"rendered":"
\"\"<\/a>

35mm focal length Tessar with RMS thread<\/p><\/div>\n

Toronto<\/strong>. In the days of minicams (mainly 35mm), \u00a0subjects could be focussed from infinity down to about a metre. Any subject closer needed accessories like front element lenses, extension tubes, bellows, or special closeup stands.<\/p>\n

If a lens was asymmetrical, a ring would allow the lens to be reversed then attached to possibly improve the resulting image’s flatness of field and resolution.<\/p>\n

Macro was defined as a 1:1 film image to subject size. Macro was usually lumped in with closeups in the ‘closer than a metre’ shots. Going to larger than subject sizes on the tiny 35mm film negative required more special tools. For example, a camera could be mounted on a microscope in place of the eye-piece and the subject taken with the microscope’s objective lens.<\/p>\n

However objective lenses had no aperture adjustment as they were used wide open. Some makers decided to remedy this by offering a special lens with an aperture to be used in lieu of the usual objective. This would allow the depth of field to be increased. Above is a tiny 35mm focal length Tessar<\/a> with an RMS thread (the Tessar is shown here beside a Canadian Looney for size comparison).<\/p>\n

Different microscope makers created a ‘line’ of lenses allowing various degrees of subject magnification. A typical shot is shown in a March 2020 post titled, “up close and personal<\/a>“. The post gives added details to the 1930s Tessar<\/a> which I bought back in March, 1995 from Pim Schryer (a few sources suggest such a low serial number means a far older lens, but it wasn’t until 1930 when a redesigned Tessar allowed f\/3.5 lenses. Perhaps the smaller frame size needed here allowed f\/3.5 with an earlier lens design.).<\/p>\n

Savvy camera makers such as Zeiss and Leitz made adaptors to mount the tiny RMS threaded lens on traditional bellows, etc.<\/p>\n","protected":false},"excerpt":{"rendered":"

Toronto. In the days of minicams (mainly 35mm), \u00a0subjects could be focussed from infinity down to about a metre. Any subject closer needed accessories like front element lenses, extension tubes, bellows, or special closeup stands. If a lens was asymmetrical, … 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":[401,512,4423,23],"class_list":["post-26791","post","type-post","status-publish","format-standard","hentry","category-history","tag-lens","tag-microscope","tag-rms-thread","tag-zeiss"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/26791","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=26791"}],"version-history":[{"count":2,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/26791\/revisions"}],"predecessor-version":[{"id":26796,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/26791\/revisions\/26796"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=26791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=26791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=26791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}