Last week I lamented the fact that I did not like the two images I was presenting and that at times there can be overriding factors as to whether an image is worthy of publication. I didn’t like the photos because they were of poor quality in my opinion. The stuff was worthy of publication because it documented strange and unusual occurrences. Today lets take a look at the hawk image and first focus on why I think it is of poor quality. There are three things that I don’t like about the image, what do you think they are? Take a moment, look at it, and make a note of what you think is wrong.
OK pencils down.
First the image is not as sharp as it should be. True that, but exactly why is it not so sharp? Shutter speed is indeed quite low we all have to agree, crop sensor, 300mm with a 1.4x teleconverter says I need around a 1/500sec shutter compensate with the Nikon VR vibration reduction and maybe one could push the speed down to around 1/125sec. So it is simple, not enough shutter speed. But wait, look close and you will see the feet of the hawk are quite sharp. Oh you might say, in that case the depth of field is just too shallow because the head is not nearly as sharp as the feet. Nope, I won’t go into the detail here but given the distance math proves the focal plane should have both the head and feet in focus, in fact the head and feet are very close to being on the same plane in the first place. The real culprit does go back to shutter speed but it about movement related to the scene not the camera and lens. a theory that I have yet to confirm or deny it’s that many bird and raptors in particular quickly oscillate their heads as part of their focus mechanism. It makes sense in that it would help aid in-depth perception to have more than one perspective to reference in your vision. In any case, it is important to remember that movement in the scene is in no way effected by and VR, IS, OS, or any other optical stabilization offered by the camera or lens. Movement in the scene also is not in any way effected by the focal length that is being used, so if you scene requires a minimum shutter of 1/160sec that is it, no further math involved, and no way to get around it.
The key to making the sharpest possible image at extremely low shutter speeds is to make a lot of images. Set that frame rate as high as it will go and burn a bunch of images but it also increases the chances that it will capture that very brief moment when you the camera and lens are free of movement as well as the subject in the scene. Yeah it really works. When in doubt drop the hammer and chances are pretty good the will be a sharp one in the group.
Another thing I don’t like about this photo is the background, in a word it sucks. Even though it is nice and blurry there is a pattern in the background and that pattern is the tell-tale curse of the chain link fence. It is fairly easy to eliminate chain link fence infant of your wildlife subject but behind is another story. In this case it was at an effective focal length of 630mm shooting wide open at f4 fence about 15 feet behind the subject. As you can see it is nice and blurry but the pattern of the chain link is visible. Because this fencing is often coated with a bright galvanized finish it usually contrasts with the rest of the background, overly bright if in sunlight or dark in shade. Removing the unwanted lines is more difficult than it appears in Photoshop also, so don’t think it is easily fixed problem.
Lastly, I just don’t like the colors. It is OK I suppose but there is a sharp contrast between the ground and the rest of the background. It creates a horizon line with a hard transition from tan to green. We are in the midst of a severe drought this year and much of the foliage is off-color. Normally this time of year that chain link fence would not even be visible, it would be covered in green and gold making a sometimes spectacular background. Mother has given us a difficult situation and the is only one good way to handle that, try different perspectives. Go higher or lower than the usual comfort positions and always be mindful of the back ground.
Today I am also including one of my favorite hawk pictures so you won’t feel cheated on a good image for another week :). Thank You for stopping by, I hope my little reminders and failures help you and your photography.
Please, don’t forget you can download the latest version of my iPad application Nature and Wildlife Wallpaper below.