"The bird is A wing guided by an eye"...Dr. Jonathan T. Erichsen, School of Optometry & Vision Sciences, Cardiff University.
Eyes may be more important to birds than to humans. One indication of this is that bird eyes are much larger, relative to total face area, than human eyes.
Birds may see more colors than humans. In fact they may be able to perceive ultraviolet or near-ultraviolet light, which humans cannot.
In contrast to human retinas, bird retinas contain no blood vessels. This prevents shadows and light scattering, which cut down on human vision.
It's been suggested that sharpness of vision may not even be the birds' main sight-advantage over humans. Rather, their advantage may lie in their brain's ability to capture at a glance a picture that a human eye would have to scan back and forth to see and understand.
Camera settings: 1/100 sec - f/2.8 - ISO 200 - FL 200mm.
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