Now that I have PhotoshopCS6 and the Adaptive Wide-angle filter that controls the fisheye curvature, that is sometimes not wanted, it makes the lens a more usable lens for landscape images. The 180 degree view is amazing.
Some loss of details in the shadows
I feel that more detail in the dark areas should take away from the center of interest, the open door showing the plowed field.
This wide angle filter sounds and looks good.