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2022-04-06 Recent Experience on Fujifilm GFX100S on Focusing Precision and Accuracy in the Field

2022-03-23 5 Years and Counting, Fujifilm Medium Format Autofocus Lacks Precision and Accuracy for Erratic Sharpness + Reader Comments

2022-02-28 Fujifilm GFX100S: Focus Accuracy and Precision with Fujifilm GF 50mm f/3.5

2022-02-27 Fujifilm GFX100S: Focus Accuracy and Precision with Fujifilm GF 35-70/4.5-5.6 @ 58mm

2022-02-26 Autofocus Accuracy: Fujifilm GFX100S + Fujifilm GF 35-70mm f/4.5-5.6

2022-01-14 Leica M11 — Rangefinder vs EVF Focusing Accuracy

2021-10-29 Canon RF 35mm f/1.8 Macro STM: Focusing Accuracy on Canon EOS R5

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

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

2012-08-11 Nikon D800 / D800E autofocus Precision

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See also 1 pages at windinmyface.com

2023-09-23 Apple Watch: Validity of Exercise Metrics and Usability, an Extreme Endurance Cyclists’s Perspective

2014-04-13 Accuracy and Precision of a Power Meter

Sharpness and Zone of Focus

Sharpness loss by focusing or zone of sharp focus..

  1. Accuracy and Precision
  2. Blur by Autofocus Error

Focus Shift and Spherical Aberration

Elusive sharpness, depending on aperture.

  1. Detecting and Mitigating Focus Shift

Camera and Lens Tolerances

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

  1. Mount Flange to Sensor Parallelism

How to Test A Lens

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

  1. Focusing Accuracy When Testing

Shooting Considerations

All about shooting in infrared..

  1. Focusing Overview

Leica SL3

60 megapixel 3rd generation..

  1. Leica SL3: Autofocus Errors

Nikon D850

The best becomes better..

  1. Experience Report: Autofocus Precision and Focus Shift, Nikon 14-24mm f/2.8G

Nikon D800E

36 megapixels in a compact full-frame DSLR..

  1. Autofocus AF-S Accuracy: Nikon 85/1.4G, 85/1.8G (Mosaic)
  2. Autofocus AF-S Accuracy: Nikon 85/1.4G (Trash Can)
  3. Autofocus AF-S Accuracy and Precision: Lens Align Target

Nikon D800E vs D800

D800E supplement and comparisons with Nikon D800..

  1. D800E vs D800 RAW Sharpening Comparison (Dolls)
  2. D800E AF-S Accuracy: Nikon 28/1.8G (Mosaic)

Nikon D5

High speed big brick shooter..

  1. Nikon D5 + 85mm f/1.4G Autofocus Accuracy, Lens Align Target
  2. Nikon D5 + 85mm f/1.4G Autofocus Accuracy, Outdoor Targets

Canon EOS 1D X

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

  1. Focusing Accuracy with 85mm f/1.2L 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..

  1. Focus Accuracy

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..

  1. Shooting Mode Issues

Tilt / Shift Lenses (General)

Basic tilt/shift lens concepts..

  1. Build Quality: Nikon vs Canon

Sigma 35mm f/1.4 DG HSM Art

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

  1. Autofocus Calibration vs Nikon 35/1.4G (Lens Align, Nikon D800E)

Sigma 85mm f/1.4 DG HSM Art

Sigma’s best portrait lens..

  1. Sigma 85mm f/1.4 DG HSM Art

Sigma Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

  1. Autofocus Comments

Nikon AF-S 28mm f/1.8G

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

  1. Focus Shift Study (Dolls)

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

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

  1. Comparison at 17mm with Canon TS-E 17mm f/4L

Fujifilm GFX, General

100 megapixels in a portable package!.

  1. Fujifilm GFX100/GFX100S: Configuring and Using Stopped-Down Manual Focus

Fujifilm GFX100S

100 megapixels in a body the size of a 35mm DSLR!.

  1. Fujifilm GFX100S: Focus Precision and Accuracy with Fujifilm GF 35-70/4.5-5.6 @ 58mm
  2. Fujifilm GFX100S: Focus Precision and Accuracy with Fujifilm GF 50mm f/3.5

Fujifilm GF 63mm f/2.8 R WR

Standard normal lens equivalent to 52mm f/2.3..

  1. Aperture Series: Cerro Gordo Church (GFX 50S, Focus Variability)
  2. Aperture Series: View to Mt Whitney From Alabama Hills (GFX 50S, Focus Variability)

Fujifilm GF 120mm f/4 Macro R LM OIS WR

High performance macro photography on medium format, equivalent to 99mm f/3.3..

  1. Aperture Series: View to Mt Whitney From Alabama Hills (GFX 50S, Focus Variability)

Hasselblad X1D II 50C

Mirrorless large format with leaf shutter lenses, 2nd generation..

  1. BUG: Hasselblad X1D II Confirms Focus in Dim Light when Badly Out of Focus
  2. Usability: Autofocus, Live View, Self-Timer, Haptics, etc

Leica S Typ 006

The last CCD-sensor Leica S model..

  1. Error-Prone Autofocus Damages Sharpness (S006)

35mm f/1.4 Distagon

Strokes of a master..

  1. Focusing the 35/1.4 Distagon Manually By Eye

Zeiss LensSpire Articles

Articles written for Lenspire.ZEISS.com..

  1. Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges 📹

Focus

Focus accuracy and focus shift..

  1. Overview Focus Accuracy

Misc Reviews

Miscellaneous reviews..

  1. Canon EOS Meets Leica—1D Mark III Mated to APO-Elmarit-R 180/2.8

15mm f/2.8 Distagon Zeiss Interview

Q&A on the 15/2.8 Distagon with Dr. Hubert Nasse.

  1. Zeiss 15/2.8 Distagon Q&A — Question List

Canon EOS R5

Canon’s high-res mirrorless..

  1. Focusing Accuracy

Canon RF 35mm f/1.8 Macro STM

All-arounder compact lens with macro capability..

  1. Focusing Accuracy on Canon EOS R5

Nikon Z8

Setup, IBIS performance, focusing..

  1. Autofocus Errors in Low Light

Nikon Z7 Overview, Setup, General

Setup, IBIS performance, focusing..

  1. Nikon Z7 Aperture/Lens Diaphragm Behavior While Viewing/Focusing

Nikon Z7 IBIS and Focusing

Setup, IBIS performance, focusing..

  1. Validating Focus Accuracy of the Nikon Z7, Extensive Field Shooting
  2. Autofocus Accuracy: Zone of Focus Error, Example and Mitigation
  3. Autofocus Accuracy: Pinpoint AF vs Magnified Live View Reference

Sony FE 85mm f/1.4 GM

Top-grade medium telephoto..

  1. Troubling Focus Accuracy at f/1.4 and f/4, Controlled Conditions (Dolls)
  2. Focus Accuracy at f/1.4 (Outdoors)

Sigma FE 14mm f/1.8 DG HSM Art

Outstanding fast wide angle, DSLR optical design..

  1. Overview of Sigma FE 14mm f/1.8 DG HSM Art

Sony FE 16-35mm f/2.8 GM II

Pro-grade f/2.8 wide angle zoom, updated..

  1. Introduction to Sony FE 16-35/2.8 GM II

Sony FE 16-35mm f/2.8 GM

Pro-grade f/2.8 wide angle zoom..

  1. Introduction to Sony FE 16-35mm f/2.8 GM

Olympus Zuiko 12-40mm f/2.8 PRO Zoom

A high performance mid-range zoom..

  1. Shootout: 12-40/2.8 vs SHG 14-35/2 vs Panasonic 25/1.4 Summilux (EM1, Yellow Wagon)

Zeiss Batis (Overview)

Zeiss autofocus lenses Sony full-frame mirrorless..

  1. OLED Depth of Field and Distance Display

Leica M11

Leica M 60 Megapixels..

  1. Focusing Accuracy with Rangefinder vs EVF
  2. Leica M11 sRGB Color Gamut Creates Dull and Lifeless Images

Leica M Typ 240 Usability Issues

Specific issues affecting usability..

  1. Usability: Rangefinder Error When Brand New

Leica M9: Focusing with the Rangefinder

Focusing issue.

  1. Focusing with a Rangefinder — Intro

Leica 90mm f/2 APO-Summicron-M ASPH

Leica’s longer tele for Leica M..

  1. 90mm f/2 APO-Summicron-M ASPH


Blog posts, reverse chronological

2022

2022-04-06 Recent Experience on Fujifilm GFX100S on Focusing Precision and Accuracy in the Field

2022-03-23 5 Years and Counting, Fujifilm Medium Format Autofocus Lacks Precision and Accuracy for Erratic Sharpness + Reader Comments

2022-02-28 Fujifilm GFX100S: Focus Accuracy and Precision with Fujifilm GF 50mm f/3.5

2022-02-27 Fujifilm GFX100S: Focus Accuracy and Precision with Fujifilm GF 35-70/4.5-5.6 @ 58mm

2022-02-26 Autofocus Accuracy: Fujifilm GFX100S + Fujifilm GF 35-70mm f/4.5-5.6

2022-01-14 Leica M11 — Rangefinder vs EVF Focusing Accuracy

2021

2021-10-29 Canon RF 35mm f/1.8 Macro STM: Focusing Accuracy on Canon EOS R5

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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$200 Leica BP-SCL6 Lithium-Ion Battery (8.4V, 2200mAh) BACK IN STOCK in Accessories: Batteries and Power
$450 Leica M-Adapter L BACK IN STOCK in Lens Accessories

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