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Field Curvature

Zone of focus, not plane of focus.

How to Test A Lens

How to verify a good sample and assess all aspects of lens performance..

25mm f/2 Distagon

Ultra high performance with a fast aperture..

Otus 55mm f/1.4 APO-Distagon

Ultra high performance apochromatic normal lens, first in the Otus line..

100mm f/2 Makro-Planar

King of bokeh! Corner-to-corner sharpness, world class..


Blog posts, reverse chronological

2018

2018-10-09 Nikon Z7: Image Sharpness vs Zone of Focus, Autofocus Error and Mitigation

2015

2015-07-16 Left/Right Zone of Focus Skew: Not Always the Lens, the Sensor and Lens Mount Might not be Plane-Parallel

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