{"id":75522,"date":"2019-09-07T05:18:03","date_gmt":"2019-09-07T11:18:03","guid":{"rendered":"https:\/\/www.featheredphotography.com\/blog\/?p=75522"},"modified":"2019-09-07T06:02:39","modified_gmt":"2019-09-07T12:02:39","slug":"northern-harrier-how-gaze-stabilization-saved-an-interesting-photo","status":"publish","type":"post","link":"https:\/\/featheredphotography.com\/blog\/2019\/09\/07\/northern-harrier-how-gaze-stabilization-saved-an-interesting-photo\/","title":{"rendered":"Northern Harrier &#8211; How Gaze Stabilization Saved An Interesting Photo"},"content":{"rendered":"<p>It took me years to realize what saved this image. Prepare yourself for some photo and bird geekiness as I explain.<\/p>\n<p>I posted the following photo of a Northern Harrier hovering over potential prey at Bear River MBR to my blog several years ago, lamenting the fact that most of the bird was soft.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"75523\" data-permalink=\"https:\/\/featheredphotography.com\/blog\/2019\/09\/07\/northern-harrier-how-gaze-stabilization-saved-an-interesting-photo\/northern-harrier-7229-ron-dudley-2\/\" data-orig-file=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley.jpg\" data-orig-size=\"900,727\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;6.3&quot;,&quot;credit&quot;:&quot;RON DUDLEY&quot;,&quot;camera&quot;:&quot;Canon EOS 7D Mark II&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1504597392&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;700&quot;,&quot;iso&quot;:&quot;800&quot;,&quot;shutter_speed&quot;:&quot;0.0015625&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"northern harrier 7229 ron dudley\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley.jpg\" class=\"aligncenter wp-image-75523 size-full\" title=\"northern-harrier-7229-ron-dudley\" src=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley.jpg\" alt=\"\" width=\"900\" height=\"727\" srcset=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley.jpg 900w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley-300x242.jpg 300w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley-768x620.jpg 768w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley-150x121.jpg 150w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley-400x323.jpg 400w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<p style=\"text-align: center;\"><em>1\/640, f\/6.3, ISO 800, Canon 7D Mark II, Canon EF 500mm f\/4L IS II USM + EF 1.4 III Extender, not baited, set up or called in<\/em><\/p>\n<p>The softness was caused by a very slow shutter speed which was the result of early morning light and smoke in the air from wildfires up north. Normally I&#8217;m addicted to sharpness in my bird photos but I still liked this one and I wasn&#8217;t sure why. The head is &#8220;sharp enough&#8221; and that&#8217;s what saved the image. If the head had been as soft as the body I&#8217;d have trashed it. The tail is also reasonably sharp but the rest of the bird is soft.<\/p>\n<p>I liken this shot to some waterfall or stream landscape photos that are deliberately taken at slow shutter speeds to achieve the effect of movement. It isn&#8217;t my typical style but I think it&#8217;s quite interesting and I like it more as time goes by.<\/p>\n<p>So why is the head sharp (enough) and the body, wings, legs and feet are not? The reason for the wings being soft is obvious &#8211; motion blur at this very slow shutter speed but what about the rest of the bird that is soft?<\/p>\n<p>The answer didn&#8217;t hit me until last night when I stumbled upon the image again and thought about it some more. The head is significantly sharper due to &#8220;gaze stabilization&#8221; (sometimes called head stabilization) in birds, especially those that are hovering over prey or hunting from an unstable perch.<\/p>\n<p>Rather than try to explain it to my readers please watch this amazing <a href=\"https:\/\/www.audubon.org\/news\/for-birds-steady-head-key-incredible-focus\" target=\"_blank\" rel=\"noopener noreferrer\">video clip of a kingfisher hunting for fish from a perch moving in the breeze<\/a>. I promise it&#8217;ll be worth your time.<\/p>\n<p>When birds are hunting visually (or audibly or both) it&#8217;s a huge advantage to <em>not<\/em> have their head, eyes and ears bouncing around. If they can keep their head stable, even while hovering or hunting from an unstable perch, they have a significantly improved chance of zeroing in on prey for reasons that should be obvious. You may have held a pigeon in your hands and noticed this phenomenon. Even chickens do it. As a kid on the Montana farm I was endlessly fascinated by watching a chicken&#8217;s head remain absolutely still as I moved the rest of its body around in front of me with my hands.<\/p>\n<p>In a way the process and results of gaze stabilization in birds are very similar to image stabilization in many of our modern cameras and lenses.<\/p>\n<p>So that&#8217;s why my harrier&#8217;s head is so much sharper than the rest of its body &#8211; it was holding its head still as it hovered even though most of the rest of its body was moving more so those parts turned out soft. I think the tail is sharp because just by chance my shutter fired when it wasn&#8217;t moving. Dangling legs in a hovering harrier move a lot.<\/p>\n<p>&nbsp;<\/p>\n<p>Oh, one more thing. Photographers among my readers may wonder where my active focus point was when my shutter fired. I was curious about the same thing so I used software that comes with Canon cameras (Digital Photo Professional) to find out.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"75525\" data-permalink=\"https:\/\/featheredphotography.com\/blog\/2019\/09\/07\/northern-harrier-how-gaze-stabilization-saved-an-interesting-photo\/northern-harrier-7229-focus-points-ron-dudley\/\" data-orig-file=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley.jpg\" data-orig-size=\"900,602\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"northern harrier 7229 focus points ron dudley\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley.jpg\" class=\"aligncenter size-full wp-image-75525\" src=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley.jpg\" alt=\"\" width=\"900\" height=\"602\" srcset=\"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley.jpg 900w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley-300x201.jpg 300w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley-768x514.jpg 768w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley-150x100.jpg 150w, https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-focus-points-ron-dudley-400x268.jpg 400w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<p>My active focus point is the square in red (I had the rest of my points turned off.) As you can see I barely kept the harrier in frame and the active point wasn&#8217;t even (quite) on the bird. But if you&#8217;ve ever tested the focusing range of a single point as I have you know that it&#8217;s actually significantly larger than the point itself. So I believe I was locked on to the head of the bird or at least close to being locked.<\/p>\n<p>Some might think all this is much ado about very little but I like to understand this kind of stuff about birds and about photography. It helps me to become a better bird photographer.<\/p>\n<p>Ron<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It took me years to realize what saved this image. Prepare yourself for some photo and bird geekiness as I explain.<\/p>\n<p> <a class=\"continue-reading-link\" href=\"https:\/\/featheredphotography.com\/blog\/2019\/09\/07\/northern-harrier-how-gaze-stabilization-saved-an-interesting-photo\/\"><span>Continue reading<\/span><i class=\"crycon-right-dir\"><\/i><\/a> <\/p>\n","protected":false},"author":2,"featured_media":75523,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[338,6,334,341],"tags":[49,86,2303,146,4717,4718,1347,222,234,311],"class_list":["post-75522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bear-river-migratory-bird-refuge-favorite-locations","category-bird-photography-methods","category-birds","category-northern-harriers","tag-bear-river-migratory-bird-refuge","tag-circus-cyaneus","tag-digital-photo-professional","tag-flight","tag-gaze-stabilization","tag-head-stabilization","tag-hovering","tag-motion-blur","tag-northern-harrier","tag-utah-2"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/featheredphotography.com\/blog\/wp-content\/uploads\/2019\/09\/northern-harrier-7229-ron-dudley.jpg","jetpack_shortlink":"https:\/\/wp.me\/p1zzJh-jE6","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/posts\/75522","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/comments?post=75522"}],"version-history":[{"count":0,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/posts\/75522\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/media\/75523"}],"wp:attachment":[{"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/media?parent=75522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/categories?post=75522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/featheredphotography.com\/blog\/wp-json\/wp\/v2\/tags?post=75522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}