{"id":15878,"date":"2012-02-06T19:30:41","date_gmt":"2012-02-06T11:30:41","guid":{"rendered":"http:\/\/www.chekyang.com\/musings\/?p=15878"},"modified":"2017-02-25T19:47:57","modified_gmt":"2017-02-25T11:47:57","slug":"sigma-apo-70-200mm-f2-8-center-sharpness","status":"publish","type":"post","link":"https:\/\/www.chekyang.com\/musings\/2012\/02\/06\/sigma-apo-70-200mm-f2-8-center-sharpness\/","title":{"rendered":"Sigma APO 70-200mm F2.8 &ndash; Center Sharpness"},"content":{"rendered":"<p>Post that\u2019s only for Matt and the student-stalker.=)<\/p>\n<p>Here\u2019s a bunch of haphazardly-taken pictures during lunch time of construction work from some distance away. Source image as follows:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt;\" title=\"blog-2012-photography-N7K_0982-f9\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/blog-2012-photography-N7K_0982-f9_thumb.jpg\" alt=\"blog-2012-photography-N7K_0982-f9\" width=\"600\" height=\"397\" border=\"0\" \/><\/p>\n<p>The below are 100% crops, with the vehicle\u2019s plate number as my focusing point. All handheld, optical stabilizer ON, and shot at 200mm and at ISO1600, excepting the first shot that was at ISO900 (forgot to fix the ISO \u2013 whoops!). Here we go:<\/p>\n<figure style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt none;\" title=\"2012-photography-test-f2.8_cr1\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/2012-photography-test-f2.8_cr1.jpg\" alt=\"2012-photography-test-f2.8_cr1\" width=\"600\" height=\"400\" border=\"0\" \/><figcaption class=\"wp-caption-text\">ISO900, 1\/8000s, f2.8. Yep &#8211; quite soft right in the center when shot wide-open.<\/figcaption><\/figure>\n<figure style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt none;\" title=\"2012-photography-test-f4.0_cr1\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/2012-photography-test-f4.0_cr1.jpg\" alt=\"2012-photography-test-f4.0_cr1\" width=\"600\" height=\"400\" border=\"0\" \/><figcaption class=\"wp-caption-text\">ISO1600, 1\/8000s, f4.0. Much better than f2.8. The full image resized for web purposes looks pretty alright too, though it might benefit from a slight bit of sharpening in post-processing.<\/figcaption><\/figure>\n<figure style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt none;\" title=\"2012-photography-test-f5.6_cr1\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/2012-photography-test-f5.6_cr1.jpg\" alt=\"2012-photography-test-f5.6_cr1\" width=\"600\" height=\"400\" border=\"0\" \/><figcaption class=\"wp-caption-text\">ISO1600, 1\/4000s, f5.6. From here on, the full image looks acceptable for web use as it is without post-processing.<\/figcaption><\/figure>\n<figure style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt none;\" title=\"2012-photography-test-f7.1_cr1\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/2012-photography-test-f7.1_cr1.jpg\" alt=\"2012-photography-test-f7.1_cr1\" width=\"600\" height=\"400\" border=\"0\" \/><figcaption class=\"wp-caption-text\">ISO1600, 1\/2500s, f7.1. Slightly sharper still!&#8221;<\/figcaption><\/figure>\n<figure style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0pt none;\" title=\"2012-photography-test-f9_cr1\" src=\"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/2012-photography-test-f9_cr1.jpg\" alt=\"2012-photography-test-f9_cr1\" width=\"600\" height=\"400\" border=\"0\" \/><figcaption class=\"wp-caption-text\">ISO1600, 1\/1600s, f9. Not much difference now for center sharpness between f7.1 to f9.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Post that\u2019s only for Matt and the student-stalker.=) Here\u2019s a bunch of haphazardly-taken pictures during lunch time of construction work from some distance away. Source image as follows: The below are 100% crops, with the vehicle\u2019s plate number as my<\/p>\n<div class=\"entry-read-more\"><a class=\"read-more-link\" href=\"https:\/\/www.chekyang.com\/musings\/2012\/02\/06\/sigma-apo-70-200mm-f2-8-center-sharpness\/\">Read More<span class=\"cleanwp-sr-only\">  Sigma APO 70-200mm F2.8 &ndash; Center Sharpness<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":15867,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[518,522],"class_list":["post-15878","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-photography-cameras","tag-d7000","tag-sigma-70-200mm-f2-8","wpcat-13-id"],"jetpack_featured_media_url":"https:\/\/www.chekyang.com\/musings\/wp-content\/uploads\/2012\/02\/blog-2012-photography-N7K_0982-f9_thumb.jpg","_links":{"self":[{"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/posts\/15878","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/comments?post=15878"}],"version-history":[{"count":0,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/posts\/15878\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/media\/15867"}],"wp:attachment":[{"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/media?parent=15878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/categories?post=15878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chekyang.com\/musings\/wp-json\/wp\/v2\/tags?post=15878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}