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Canon 24mm f/1.4L II

Field curvature and Aberrations (Night-time)

The image was taken at f/1.4, and studying it gets curiouser and curiouser (apologies to anyone named Alice).

Through serendipity, the focus for this example happens to demonstrate the varying zone of sharpness of the 24/1.4L II (field curvature). Sharpness varies very noticeably at similar distances, from obviously blurred to fully sharp, depending on the offset from center—field curvature.

Metreon area at night, San Francisco

Adobe Camera Raw 8.8.0 (397). ACR settings. Camera Profile = Camera Portrait.

The camera was tilted slightly down, which aligns the plane of focus to more distant areas at top, and closer areas at bottom.

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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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