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See also: depth of field
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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..

Nikon Z7 Overview, Setup, General

Setup, IBIS performance, focusing..

Nikon Z7 IBIS and Focusing

Setup, IBIS performance, focusing..

Nikon NIKKOR Z 35mm f/1.8 S

Moderate wide angle expressly designed for Nikon Z cameras..

Nikon NIKKOR Z 24-70mm f/4 S

Mid-range zoom expressly designed for Nikon Z cameras..

Sony FE PZ 28-135mm f/4G OSS

Wide mid-range zoom targeted at video shooters..

Olympus OM-D E-M5

Superb ergonomic design in a compact camera..

Zeiss Loxia 21mm f/2.8 Distagon

Outstanding ultra wide angle performer..


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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