He was about 12 yards away which makes depth of field critical with this lens (400/2.8 w/1.4 converter). Actual depth of field was about 1.5 inches in either direction. Gotta make sure the eye is in the focus point! You can see how quickly the focus fades away from the eye. But in this case shallow DOF also helped by blurring out the strands of vegetation in front of the bird. Which would have been distracting if they were in focus....
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