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Achieving Corner to Corner Sharpness: Mosaic

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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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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Entire frame as shot at f/5.6

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