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Skewed Plane of Focus

This banal photo shows something very odd.

I focused on the poppy (orange) at center bottom. Observe how focus slices diagonally through the frame, roughly speaking from the upper left down through the poppy to lower right: the plane of focus is skewed. This cannot be reconciled with the reality of the situation.

This also explains some bizarre sharpness results I saw with other field shots, where there was blurring where there should have been none, and sharpness where it should not have been.

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diglloyd Advanced Photography

diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.

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Entire frame as shot at f/5

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