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Nikon 16-35/4 VR and 17-35/2.8 (not to scale)  
Nikon 85mm f/1.4G

Focus Shift with a 3D Subject, Head Shot Range (Dolls)

See also the study of the Nikon 14-24 and 24-70 zooms and the focus shift study of the Nikon AF-S 24/1.4G and 35/1.4G.

Focus shift and how to mitigate it are discussed in detail in Making Sharp Images.

Test scene

The 36-megapixel Nikon D800E was used as shown below. The test scene measures 15" (38 cm) across, so this corresponds to a tight “head shot” portrait.

Focus was on the doll’s eyes (Miss Checkerboard at center), with the ruler as a reference point for observing the amount of focus shift. The doll’s eyes correspond to the ~ “14.5” mark on the ruler.

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Test scene, entire frame at ƒ/1.4

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