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Pentax 645Z

Pentax 90/2.8 Focus Shift Assessment

Shot on the Pentax 645Z.

Displacement of the zone of sharp focus that comes with stopping down is a serious challenge when working with high resolution digital sensors, so an assessment of focus shift for each lens is a critical part of the shot discipline for any serious photographer.

See Making Sharp Images for an in-depth discussion of focus shift.

Focus shift with the 90/2.8

This crop taken from the Dolls aperture series.

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Diglloyd Medium Format covers medium format camera systems, including the Hasselblad X1D and Fujifilm GFX.

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  • In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
  • How to configure menus and buttons and best operating practices, gotchas and how-to.
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens and camera behaviors.
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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
Aperture series 2.8,4,5.6,8,11,16,22 available in full article

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