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How To Get Peak Sharpness With Perfect Focus

Focusing is more complicated than it first appears..

Focusing Accuracy (Case Studies)

Focusing accuracy and errors..

Depth of Field

Controlling the zone of sharp detail..

Depth of Field Mitigations

Increasing Depth of Field by means other than stopping down..

How to Test A Lens

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

Research — Handheld Shooting

Research into sharpness of handheld images with and without image stabilization.

Hasselblad X1D

Mirrorless large format with leaf shutter lenses..


Blog posts

2018

2018-07-15 Reader Comment: Automated Focus Stacking

2018-07-11 Reader Comment: Sony Mirrorless Focusing in Low Light

2018-07-11 Reader Comment: Zeiss Batis or Sigma Art FE?

2018-01-30 Fujifilm GFX Does not Always Focus at Full Aperture, Could it Be Compensation for Focus Shift?

2017

2017-08-12 Fujifilm GFX Does not Always Focus at Full Aperture

2017-06-18 Reader Question: Camera/Lens Focus Calibration

2017-04-02 Hasselblad X1D: Autofocus Errors with Hasselblad XCD 90mm f/3.2 Update: Confirmed, Hasselblad Working On It

2017-03-26 Hasselblad X1D: Unacceptable Autofocus Errors with Hasselblad XCD 90mm f/3.2 (Update)

2017-03-25 Hasselblad X1D: Unacceptable Autofocus Errors with Hasselblad XCD 90mm f/3.2

2016

2016-10-15 Reader Question: Focusing with Sony Mirrorless

2015

2015-07-28 Leica S Typ 006: Autofocus Errors

2013

2013-09-13 What Every Leica X Vario User Should Know About Autofocus and Manual Focus

2013-08-01 Field Curvature of the Zeiss 15mm f/2.8 Distagon with Focus Bracketing

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

2013-01-22 Olympus Zuiko 17mm f/1.8 on E-M5: Stepped vs Continuous Focusing

2013-01-13 Canon EF 40mm f/2.8 STM: Focus Bracketing Study (applicable to ANY brand camera or lens)

2011

2011-03-02 Focusing the Leica M9 with the Zeiss 3X loupe — Fantastic

2011-01-21 Focusing the Pentax 645D with the Zeiss 3X loupe

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