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    Conclusions on Mosaic Comparisons —

This mosaic comparison used the Nikon D3x, a 24 megapixel DSLR with ~ 5.6 micron pixels — a challenge for any lens.

This comparison also has its limitations: the lenses were effectively at infinity focus. Performance at other distances can change significantly, as can field curvature, and the combination of focal length and focus distance is endless.

Summary of aperture performance

Apertures f/2.8 and f/4 vary in performance by lens and focal length, ranging from poor to outstanding. Review the crops for details, and lens notes below.

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