{"id":3809,"date":"2011-02-01T20:51:48","date_gmt":"2011-02-02T00:51:48","guid":{"rendered":"http:\/\/www.birdsasart-blog.com\/?p=3809"},"modified":"2011-02-24T11:41:39","modified_gmt":"2011-02-24T15:41:39","slug":"abstract-thoughts-a-depth-of-field-lesson","status":"publish","type":"post","link":"https:\/\/www.birdsasart-blog.com\/baa\/2011\/02\/01\/abstract-thoughts-a-depth-of-field-lesson\/","title":{"rendered":"Abstract Thoughts & A Depth-of-Field Lesson"},"content":{"rendered":"\n\n\n
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This is a crop of the abstract image from the last post here<\/a>. Canon 800mm f\/5.6L IS lens, the 1.4X II TC, and the EOS-1D Mark IV. ISO 400. Evaluative metering -1\/3 stop: 1\/500 sec. at f\/10. <\/p>\n<\/td>\n<\/tr>\n<\/table>\n

Abstract Thoughts<\/h3>\n

When I asked “Like it or Hate It?” in the last post here<\/a>, I never expected such overwhelmingly negative responses; 4 for delete, 1 ambiguous, 1 OK “but only because I have been there,” and 1 sort of liked it. The image was received quite differently in my BPN thread that featured the same image: Seven loved the image and found it interesting and provocative. Zero hated it. You can see that thread here<\/a>. Thanks to Marina Scarr for suggesting a crop from the right in Pane 10 there. The opening image here is similar but not identical to Marina’s crop. <\/p>\n

Several folks stated or implied that they would delete the image because “they did not know what it was.” Jeez, I thought that that was the point of an abstract….<\/p>\n

From Dictionary.Reference.com<\/a>: abstract (adj.)<\/p>\n

Fine Arts <\/p>\n

a: of or pertaining to the formal aspect of art, emphasizing lines, colors, generalized or geometrical forms, etc., esp. with reference to their relationship to one another.<\/p>\n

Go figure. <\/p>\n

And oh, by the way, I liked the original but I like the repost above even more \ud83d\ude42 No hard feelings though. (I never take it personally.) Heck, the last time folks were so vehemently against an image that I liked we sold it for $700 to Oprah magazine. You gotta love it. <\/p>\n

Larry Warfield wrote, “I generally like the pattern, but the white on the right hand edge and the portion of the wing on the left hand edge keep distracting my eye from the interesting triangular pattern. I also wish the back was a little more in focus. That being said, it\u2019s easier to be a critic that an artist. I wish I could take something, at all close to that good. Nice shot.” <\/p>\n

The crop from the right takes care of the white. I too wish that the back were a bit more in focus but pelicans are very large bird and depth of field is quite limited with big lenses near minimum focusing distance. A quick visit to DOF Master<\/a> revealed that with a focal length of 1200mm (the closest drop down menu value to 1120mm) and an aperture of f\/11 (that’s what I used to create this image) that the total depth of field would be .36 inches, less than 1\/2 inch. If I dropped down to f\/22 the total depth of field would increase to .72 inches (just a shade less than 3\/4 inch). That means that I would have gained .18 inch behind the neck (that’s where I focused) and .18 inch in front of the neck, i.e., the back. So stopping down from f\/11 to f\/22 would have gained only a fraction of an inch of extra d-o-f, not nearly enough to render the back feathers in sharp focus. Those back feathers are several inches closer to us than the neck….<\/p>\n\n\n\n
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This is a screen capture from DOF Master<\/a>. Be sure to bookmark the site but only if you want to learn a ton about depth-of-field with various focal length lenses… <\/p>\n<\/td>\n<\/tr>\n<\/table>\n

Shopper’s Guide<\/h2>\n

Below is a list of the gear that I used to create the image above. Thanks a stack to all who have used the Shopper’s Guide links to purchase their gear as a thank you for all the free information that we bring you on the Blog and in the Bulletins.<\/p>\n

Canon 800mm f\/5.L IS lens<\/a> Right now this is my all time favorite super-telephoto lens.
\nCanon 1.4X II teleconverter<\/a> This is my most used accessory; I would be lost without it.
\nCanon EOS-1D Mark IV professional digital camera bod.y<\/a> And this is the very best professional digital camera body that I have even used.. <\/p>\n

And from the BAA On-line Store:<\/p>\n

Gitzo 3530 LS Tripod<\/a> This one will last you a lifetime.
\nMongoose M3.6 Tripod Head<\/a> Right now this is the best tripod head around for use with lenses that weigh less than 9 pounds. For heavier lenses, check out the Wimberley V2 head<\/a>.
\n Double Bubble Level<\/a> You will find one in my camera’s hot shoe whenever I am not using flash.
\nDelkin 32gb e-Film Pro Compact Flash Card<\/a> Fast and depen.<\/p>\n

If you are considering the purchase of a major piece of photographic gear be it a new camera, a long lens, a tripod or a head, or some accessories be sure to check out our complete Shopper’s Guide.<\/a\n\n\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"

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This is a crop of the abstract image from the last post here. Canon 800mm f\/5.6L IS lens, the 1.4X II TC, and the EOS-1D Mark IV. ISO 400. Evaluative metering -1\/3 stop: 1\/500 sec. at f\/10. <\/p>\n

Abstract Thoughts <\/p>\n

When I asked “Like it or Hate It?” in the last post here, […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[90,1],"tags":[],"class_list":["post-3809","post","type-post","status-publish","format-standard","hentry","category-90","category-misc","odd"],"_links":{"self":[{"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/posts\/3809","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/comments?post=3809"}],"version-history":[{"count":0,"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/posts\/3809\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/media?parent=3809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/categories?post=3809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.birdsasart-blog.com\/baa\/wp-json\/wp\/v2\/tags?post=3809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}