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Sharpness and Zone of Focus

Sharpness loss by focusing or zone of sharp focus..

Focus Shift and Spherical Aberration

Elusive sharpness, depending on aperture.

Camera and Lens Tolerances

Sharpness issues related to camera and lens tolerances and build quality..

How to Test A Lens

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

Nikon D850

The best becomes better..

Nikon D800E

36 megapixels in a compact full-frame DSLR..

Nikon D800E vs D800

D800E supplement and comparisons with Nikon D800..

Nikon D5

High speed big brick shooter..

Canon EOS 1D X

18 megapixel big black brick, Canon’s top of the line DSLR..

Sony A900

The 24.6 megapixel Sony A900 digital SLR is compared with Canon’ top-of-the-line 21.1MP EOS 1Ds Mark III. A field report including two comparisons with the Canon 1Ds Mark IIII, example images in color and black and white, and the Zeiss ZA 135mm f/1.8 Sonnar. Anti-Shake (SteadyShot) is assessed, as is noise behavior..

Nikon D3x 24.4-megapixel DSLR review

Includes: D3x resolution comparisons (res chart) with Nikon D3, Canon EOS 1Ds Mark III, resolution comparison on outdoor shot with Nikon D3, large examples, large wildlife examples, Nikon 200mm f/2 VR on D3x, long exposure noise ISO series, D3x sensitivity on diffraction, D3x dynamic range at ISO 100 vs ISO 50, D3x vs D3 color and noise..

Tilt / Shift Lenses (General)

Basic tilt/shift lens concepts..

Sigma 35mm f/1.4 DG HSM Art

Sigma’s fast and affordable moderate excellent wide angle..

Sigma 85mm f/1.4 DG HSM Art

Sigma’s best portrait lens..

Sigma Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

Nikon AF-S 28mm f/1.8G

A fast moderate wide angle lens with some practical difficulties..

Canon Ultra-wide Zoom Lenses: 17-40 and 16-35

Comparing the Canon 17-40mm f/4L and 16-35mm f/2.L II..

Shooting Considerations

All about shooting in infrared..


Blog posts, reverse chronological

2017

2017-12-08 Reader Comment: Fujifilm GFX Focusing Precision and Skewed Lenses

2017-10-17 Nikon D850 Experience Report: AF Fine Tune, Focusing Precision, Accuracy with the Nikon 14-24mm f/2.8G + Focus Shift Behavior

2017-05-19 Fujifilm GFX Focusing Precision and Aperture Series with GF 120/4: View to Mt Whitney From Alabama Hills

2017-04-14 Fujifilm GFX Focusing Precision and Aperture Series with 63/2.8: View to Mt Whitney From Alabama Hills

2017-04-11 Fujifilm GFX Focusing Precision and Aperture Series: Mining Town Church

2014

2014-04-18 Consistent Focusing Accuracy Requires a High-Resolution EVF: Leica M vs Sony

2012

2012-08-11 Nikon D800 / D800E autofocus Precision

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