{"id":7193,"date":"2022-02-08T14:31:50","date_gmt":"2022-02-08T14:31:50","guid":{"rendered":"https:\/\/www.pmstudios.co.uk\/blog\/?p=7193"},"modified":"2022-02-08T14:31:50","modified_gmt":"2022-02-08T14:31:50","slug":"starting-with-infra-red-photography-part-8-testing-an-older-lens","status":"publish","type":"post","link":"https:\/\/www.pmstudios.co.uk\/blog\/?p=7193","title":{"rendered":"Starting with Infra-Red Photography Part 8 &#8211; Testing an older lens"},"content":{"rendered":"\n<p>I wanted to get an older lens (1950&#8217;s to 1970&#8217;s) as these are supposed to be better for infra-red photography. I managed to get an old screw-mount lens and adaptor to do some tests. This lens was a &#8216;Zodel&#8217; brand (I haven&#8217;t heard of it either) of focal length 28mm (42mm equivalent on my camera). Here are the initial results:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8-600x400.jpg\" alt=\"\" class=\"wp-image-7194\" srcset=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8-600x400.jpg 600w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8-300x200.jpg 300w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8-150x100.jpg 150w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8-768x512.jpg 768w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1100_Zodel-28mm_r1f2.8.jpg 1000w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><figcaption>Wide open at f2.8 &#8211; rather soft<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6-600x400.jpg\" alt=\"\" class=\"wp-image-7195\" srcset=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6-600x400.jpg 600w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6-300x200.jpg 300w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6-150x100.jpg 150w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6-768x512.jpg 768w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1103_Zodel-28mm_r1f5.6.jpg 1000w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><figcaption>At f5.6 the sharpness is acceptable<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11-600x400.jpg\" alt=\"\" class=\"wp-image-7196\" srcset=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11-600x400.jpg 600w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11-300x200.jpg 300w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11-150x100.jpg 150w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11-768x512.jpg 768w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1106_Zodel-28mm_r1f11.jpg 1000w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><figcaption>At f11, it is still acceptable<\/figcaption><\/figure>\n\n\n\n<p>With the focussing of this lens, the focus scale was way off (this might be the adaptor I used) &#8211; the infinity focus point was the 3m mark! I then tried it with the 850nm filter:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1-600x400.jpg\" alt=\"\" class=\"wp-image-7197\" srcset=\"https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1-600x400.jpg 600w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1-300x200.jpg 300w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1-150x100.jpg 150w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1-768x512.jpg 768w, https:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2022\/02\/F22_1117_Zodel-28mm_f4_850nm-3m-focus_r1.jpg 1000w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><figcaption>With the 850nm filter at f4<\/figcaption><\/figure>\n\n\n\n<p>This lens seemed clear of the hotspot problem. This might be worth pursuing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I wanted to get an older lens (1950&#8217;s to 1970&#8217;s) as these are supposed to be better for infra-red photography. I managed to get an old screw-mount lens and adaptor to do some tests. This lens was a &#8216;Zodel&#8217; brand (I haven&#8217;t heard of it either) of focal length 28mm (42mm equivalent on my camera). &hellip; <a href=\"https:\/\/www.pmstudios.co.uk\/blog\/?p=7193\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Starting with Infra-Red Photography Part 8 &#8211; Testing an older lens&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[126,3,65],"tags":[],"class_list":["post-7193","post","type-post","status-publish","format-standard","hentry","category-infra-red","category-photography","category-technical"],"_links":{"self":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7193"}],"version-history":[{"count":2,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7193\/revisions"}],"predecessor-version":[{"id":7199,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7193\/revisions\/7199"}],"wp:attachment":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}