{"id":14107,"date":"2013-03-22T10:30:43","date_gmt":"2013-03-22T14:30:43","guid":{"rendered":"http:\/\/www.birdsasart-blog.com\/?p=14107"},"modified":"2013-03-24T13:32:35","modified_gmt":"2013-03-24T17:32:35","slug":"the-size-of-the-subject-in-the-frame-is-directly-proportional-to-the-square-of-the-focal-length-a-practical-example","status":"publish","type":"post","link":"https:\/\/www.birdsasart-blog.com\/baa\/2013\/03\/22\/the-size-of-the-subject-in-the-frame-is-directly-proportional-to-the-square-of-the-focal-length-a-practical-example\/","title":{"rendered":"The Size of the Subject in the Frame is Directly Proportional to the Square of the Focal Length: A Practical Example"},"content":{"rendered":"\n\n\n
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This Turkey Vulture was photographed at Indian Lake Estates with the Canon EF 600mm f\/4L IS II USM lens<\/a> and the Canon EOS-1D X Digital SLR camera<\/a>. ISO 400. Evaluative metering +1\/3 stop as framed: 1\/1000 sec. at f\/7.1 in Manual mode left the bill tip with a very few blinkies. <\/p>\n

Central sensor Surround\/AI Servo\/Rear Focus AF on the bird’s neck active at the moment of exposure. Click here<\/a> if you missed the Rear Focus Tutorial. Click on the image to see a larger version. <\/p>\n

As it almost always is when I am working from the car the lens was supported on the lowered window of my Sequoia on a BLUBB, the Big Lens Ultimate BeanBag that I designed myself. It is available only from BAA. See the BLUBB and learn more here<\/a>. Beware of cheap knock-offs; all are seriously lacking in size, heft, and quality materials. None have the non-skid material on the inside of the ears and none have the noise-less fabric top.<\/p>\n