Actually, an ISO of 100 and a polarizing filter would have improved the punch and contrast of the original to produce a result somewhat like your edit with a better sky. As far as aperture is concerned detail stays the same.Originally Posted by AcadieLibre
In terms of technology and glass, quality weaknesses tend to be at both ends of the zoom. The fastest zooms have special glass elements which improve sharpness and reduce aberrations. At the widest aperture, quality weaknesses in the lens show up in the image. As you stop down, these disappear, and then reappear at the smallest apertures. The result is that the sharpest, highest quality image appears on many lenses at f8 to f11 when the lens is not fully extended.
Hope this info. is helpful.
Tegan
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