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Carl Zeiss ZF.2 15mm f/2.8 Distagon T*

Optimizing Focus for Field Curvature and Subject (Campfire / SUV)

As with the bristlecone scene, this scene posed a dilemma: bias focus to the foreground or to the distance or somewhere in-between as a compromise, and what about field curvature?

Even after a year of field use of the 15/2.8 Distagon, this particular scene and its analysis proved to be tremendously useful in understanding why sharpness in some past work had disappointed:. It all has to do with the choice of focus + field curvature being at odds with the subject matter*.

Knowing the “shape” of the zone of focus the lens produces, higher overall lens performance can be extracted by taking the focus + field curvature into account for the particular subject matter. This analysis aims to illustrate the differing results from choice of focus combined with field curvature, and thus provide actionable advice for field work with the 15/2.8 Distagon.

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