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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..

Canon EOS 5D Mark III

22 megapixel successor to the popular 5D Mark II..

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..

Pentax K-3 (APS-C)

23-megapixel APS-C DSLR with an unusual feature set..

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 135mm f/1.8 DG HSM Art

Fastest 135mm lens yet, with ultra high performance..

Sigma Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

Sigma 50mm f/1.4 EX DG HSM on Canon EOS 1Ds Mark III

The Sigma 50mm f/1.4 is a worthy contender in the crowded 50mm area. See how it performs compared to the Canon EF 50/1.4 and EF 50/1.2L..

Nikon AF-S Nikkor 50mm f/1.8G

Nikon’s High Performance Moderately-Priced 50mm..

Nikon AF-S 28mm f/1.8G

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

Canon 200mm f/2L IS

A review of Canon’s 200mm f/2L mini super telephoto. Not just for sports, it makes a great landscape lens..

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..

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..

Sony FE 85mm f/1.4 GM

Top-grade medium telephoto..

Sigma FE 14mm f/1.8 DG HSM Art

Outstanding fast wide angle, DSLR optical design..

Sony FE 16-35mm f/2.8 GM

Pro-grade f/2.8 wide angle zoom..

Sony Cybershot DSC-RX1 / RX1R

Full frame camera in an ultra-compact body with or without anti-aliasing filter..

Olympus Zuiko 12-40mm f/2.8 PRO Zoom

A high performance mid-range zoom..

Zeiss Batis (Overview)

Zeiss autofocus lenses Sony full-frame mirrorless..

Overview of Sigma Foveon Sensor cameras

Foveon X3 true-color sensor for outstanding resolution..

Blog posts, reverse chronological


2018-10-21 Nikon Z7: Validating Focus Accuracy, Exposure, Handheld with IBIS and Nikon NIKKOR Z 35mm f/1.8 (Bishop Creek)

2018-10-21 Nikon NIKKOR Z 35mm f/1.8 S Aperture Series: Twisted Aspen Trunks, Evaluating Focus Accuracy in Dim Light

2018-10-10 Nikon Z7 Autofocus Accuracy: Pinpoint AF vs Magnified Live View Reference Frame


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

2017-10-14 Nikon D850 Experience Report: Adjusting Autofocus Accuracy with the Nikon 105mm f/1.4E

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

2017-05-07 Sigma 135mm f/1.8 DG HSM Art: How Good is Autofocus Accuracy on Nikon D810

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


2016-04-17 Sony G Master 85mm f/1.4 Focus Accuracy on Sony A7R II with Firmware 3.1

2016-04-13 Sony G Master 85mm f/1.4 Focus Accuracy


2015-08-22 Sony A7R II: Focus Accuracy Better than Any DSLR I’ve Ever Used


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


2013-07-25 MTF vs Field Curvature and Tips for Optimizing Focus

2013-04-24 Reader Comment: Autofocus Accuracy

2013-02-17 Sigma 35mm f/1.4 DG HSM: Autofocus Portraits After Fine Focus Adjust

2013-02-17 Focus Accuracy: Focusing Screens for f/1.4 Lenses in Canon, Nikon

2013-02-10 Sigma 35mm f/1.4 DG HSM: Autofocus Portraits

2013-02-10 Autofocus Accuracy: Sigma 35mm f/1.4 and Nikon AF-S 35/1.4G using Lens Align and Fine Focus Adjust


2012-12-21 Sony RX1: Focus Accuracy

2012-10-15 Sigma DP1 Merrill — Autofocus Accuracy

2012-09-02 Reader Comment: Autofocus Accuracy

2012-08-11 Nikon D800 / D800E autofocus Precision

2012-08-03 Autofocus Accuracy: Canon 1D X + EF 85mm f/1.2L II

2012-06-08 Autofocus Accuracy of Nikon D800E + Nikon AF-S 28mm f/1.8G

2012-05-18 Nikon D800E: Focus Precision Required When Testing Lenses

2012-04-12 Nikon D800 AF-S Autofocus Accuracy with Nikon 85mm f/1.4G

2012-04-12 Nikon D800 AF-S Autofocus Accuracy with Nikon 60mm f/2.8G

2012-04-11 Nikon D800 Autofocus Accuracy: 85/1.8G + 85/1.4G + Mosaic Target

2012-04-11 Nikon D800 AF-S Autofocus Accuracy with Nikon 85mm f/1.4G

2012-04-10 Nikon D800 Autofocus Accuracy

2012-04-08 Reader Comments on Nikon D800 Color Gamut, Focus Accuracy, Live View

2012-04-08 Nikon D800 Autofocus Accuracy with Nikon 85mm f/1.8G

2012-04-06 Nikon D800 Examples (Manual Focus Accuracy via Focus Assist)


2011-03-14 Autofocus Consistency With Canon and Nikon 35mm f/1.4 Lenses


2010-12-28 Focus accuracy with varying distance, Nikon D3x + AF-S 35mm f/1.4G

2010-11-23 Reader report on manual focus accuracy, installing shims on Nikon D700

2010-11-03 Leica S2 new examples and autofocus accuracy in the field

2010-05-06 Nikon 24mm f/1.4G focus accuracy issues

2010-05-06 Nikon 24mm f/1.4G awful focus accuracy issues MORE


2008-09-24 Focus accuracy


2007-07-12 Lens testing and focus accuracy


2006-08-27 Autofocus accuracy with the Canon EOS 1Ds Mark II and 85mm/f1.2L II USM

2006-06-09 Focus precision with the Canon EOS 5D and 85mm/f1.2L

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