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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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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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Entire frame as shot at f/5

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