Well, the corners are outside the depth of field (DOF) for the focal length
and "P" chosen aperture. If you want a wildlife photo with foreground,
background, and subject in focus, you must either get in closer with a wide
angle lens which will give you a better DOF for the same aperture setting,
or put the lens and camera on a tripod and really stop the lens down. The
images also suffer from chromatic aberration (or what ever it is called)
resulting in bad BOKEH. BOKEH is how the out of focus portion of an image
looks. Chromatic aberration is the separation of different colors being out
of focus at a different amount resulting in color bands that don't look
right. This is what you expect from a lens with this wide a range and
quality.
How to make this better:
Isolate only the subject--get closer or use a longer length lens
Use a wide angle lens stopped down and move in closer to show the animal in
it's environment
My 2 cents
JDW
-----Original Message-----
... It gives
only a "center" of sharpness and outside it, everything becomes
extremely soft to the extreem that some detail is ghosted of lost.
... Those photos can
really make you dizzy.
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