One well-known internet reviewer of the 200/4 states:
When the 200 ED is applied to landscape photography, f/11 is the optimum (and only) setting that renders corner-to-corner sharpness .
This page not only disproves that assertion, but shows that f/5.6 is optimal. Furthermore, quality is so high that aperture f/11 substantially degrades the image quality over f/5.6 or f/8, as would be expected from a lens that is optimal at f/5.6, for reasons of diffraction.
The optional HN-30 lens hood was not used, and it’s possible that contrast here was degraded as a result. The lens was shaded from direct sunlight.
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