The lens evaluations that follow are intended to provide a sense of how the lens performs across its aperture range. General conclusions follow after the lens evaluations for each lens.
Commentary is intentionally limited to general performance characteristics on a planar target, since technique and shooting conditions and subject matter and field curvature all exert an influence on the final results.
Do not conclude too much about a lens on a planar (flat) target given how even a small amount of field curvature can degrade planar sharpness on a 36-megapixel camera. Most lenses have at least a little field curvature, often in the mid-zones (between center and edges), and the corners, or both (wave-type field curvature).
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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.
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