__RETINA_INFO_STATUS__         WindInMyFace.com MacPerformanceGuide.com          Amazon.com OWC Wishlists Wishlists & Deals

Blog Articles Medium Format Mirrorless L-Mount DSLR Zeiss Leica Making Sharp Images BW+IR

Contrast and Phase Detect Autofocus

See also: focusing
Scroll down to see all publications and blog posts. Not all pages are curated—search.

Newest blog posts

View all 34 related blog posts...

2023-12-08 Screencast: Fujifilm GFX100 II White Stripe and Yellow Hot Clumps — Visible in Color, Awful in Monochrome 📹

2023-12-06 Fujifilm GFX 100 II: Same Horizontal White Stripes Problem as with GFX100, GFX100S 📹

2023-02-11 Fujifilm GFX100S: Horizontal White Stripes Related to PDAF?

2022-09-07 Announced: Hasselblad X2D-100C with 100 Megapixel Sensor, IBIS, Phase-Detect AF

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

2022-02-04 Phase One IQ4: Stitching For Broader Field of View, Higher Resolution + Reader Comment

2022-01-19 Reader Comment: Leica M11 vs Sony A7RIV Sensors, Monochrome Potential

2021-09-04 Reader Comment: Fujifilm GFX50S II for Monochrome Conversion and Infrared as Companion Camera to Fujifilm GFX100S?

2021-08-12 Reader Comment, Sony A1: Horizontal Stripes in Blue Channel on Some Colors such as Sunflowers (PDAF banding?)

2021-08-01 Why Has Fujifilm Made No Effort Whatsoever to Deal with the Fujifilm GFX100S Horizontal White Stripes Problem?

2021-07-24 Fujifilm GFX100: Horizontal White Stripes a Problem for Numerous Images from my last trip

2021-06-01 Don’t even Think about Using the Fujifilm GFX100S for Monochrome Landscape Images — Horizontal White Stripes Make Images Unusable

2021-05-22 Fujifilm GFX100S Image Quality Defect: PDAF Pimples

2021-04-30 Fujifilm GFX100S: Unacceptable Image Quality for Monochrome Images  — Horizontal White Stripes

2021-03-29 Reader Comment: Fujifilm GFX100S and Captures for Monochrome

2021-03-27 Fujfilm GFX100S Not Here Yet, But Extensive Coverage Planned

2021-03-15 Sony A1 PDAF Banding

2021-03-15 Sony A1 Image Quality Looks Terrific, Mostly

2021-03-09 How will the Fujifilm GFX100S Fare as to PDAF Banding

2021-03-09 Sony A1 vs Sony A7R IV: Noise, Pattern Noise and Just How Poor the Analysis Tends to Be

2021-02-08 Reader Question: Convert Nikon Z7 to monochrome vs Nikon D850?

2019-10-08 Nikon D850: the Last Best Camera for Monochrome?

2019-10-04 You Won’t Believe Your Eyes... Zeiss Milvus 135mm f/2 Aperture Series on Nikon D850 Monochrome: Pine Creek Mining Buildings (up to 183 megapixels)

2019-09-10 Panoramic Focus Stacking with Fujifilm GFX100: View to Mono Craters from Dana Crest

2019-08-18 Image Quality: Fujifilm GFX100 vs Fujifilm GFX 50S/R

2019-08-06 Fujifilm GFX100: Focus Stacking Examples with Fujifilm GF 23mm f/4, Fujifilm GF 45mm f/2.8

2019-08-05 Fujifilm GFX100: those PDAF Pixels Make Me Wish I Could have a GFX100 Without Them

2018-10-01 With Suggestions of Pattern/Banding Noise in the New Nikon Z7, It Might Make Sense to RENT Before Buying

2016-09-19 Olympus OM-D E-M1 Mark II: Major Improvements and New Features

2016-05-01 EVF Mirrorless vs DLSR

Focusing Accuracy (Case Studies)

Focusing accuracy and errors..

1. Case Study: Contrast Detect Autofocus Error, Nikon D800E

Leica SL3

60 megapixel 3rd generation..

1. Leica SL3: Autofocus Errors

Nikon AF-S 70-200mm f/4 ED VR and 70-200mm f/2.8 ED VR II

Which speed zoom for the Nikon D800/D800E?.

1. Comparison: 70-200/4 VR vs 70-200/2.8 VR II (170mm)

Pentax K-3 (APS-C)

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

1. K3 Live View and Contrast-Detect Autofocus

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 Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

1. Autofocus Comments

Phase One XF and XT Full-Frame Medium Format

Phase One XF System, Phase One IQ4, Schneider Kreuznach Lenses.

1. Phase One IQ4: Stitching For Broader Field of View, Higher Resolution

Fujifilm GFX100 II

Updated everything-better after 5 years..

1. Fujifilm GFX100 II: Horizontal White Stripes with Monochrome Images + How to Fix

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: Horizontal White Stripes with Monochrome Images aka PDAF Banding
3. Fujifilm GFX100S: Horizontal White Stripes — the Futility of Using GFX100S for Monochrome Landscape Images — Examples with ACR Settings
4. PDAF pimples

Fujifilm GFX100 Image Quality

Aspects of image quality..

1. Fujifilm GFX100: Horizontal White Stripes (PDAF Banding)
2. Fujifilm GFX100: Monochrome Conversions, Perspective

Fujifilm GF 45mm f/2.8 R WR

Moderate wide angle equivalent to 37mm f/2.3..

1. Examples: Panoramas in the Eastern Sierra and White Mountains (GFX100)

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

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

1. Focus Stacking Examples, Various (GFX100)

Hasselblad X2D 100C

Mirrorless large format with leaf shutter lenses, 3rd generation..

1. Overview of Hasselblad X2D 100C

Sony A1

Technological tour de force..

1. Examples: Image Quality

Sony Alpha A9

Blackout-free 20 fps speed demon..

1. Introduction to Sony A9

Leica M11

Leica M 60 Megapixels..

1. Monochrome Conversion from Color Images

Blog posts, reverse chronological

2023

2023-12-08 Screencast: Fujifilm GFX100 II White Stripe and Yellow Hot Clumps — Visible in Color, Awful in Monochrome 📹

2023-12-06 Fujifilm GFX 100 II: Same Horizontal White Stripes Problem as with GFX100, GFX100S 📹

2023-02-11 Fujifilm GFX100S: Horizontal White Stripes Related to PDAF?

2022

2022-09-07 Announced: Hasselblad X2D-100C with 100 Megapixel Sensor, IBIS, Phase-Detect AF

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

2022-02-04 Phase One IQ4: Stitching For Broader Field of View, Higher Resolution + Reader Comment

2022-01-19 Reader Comment: Leica M11 vs Sony A7RIV Sensors, Monochrome Potential

2021

2021-09-04 Reader Comment: Fujifilm GFX50S II for Monochrome Conversion and Infrared as Companion Camera to Fujifilm GFX100S?

2021-08-12 Reader Comment, Sony A1: Horizontal Stripes in Blue Channel on Some Colors such as Sunflowers (PDAF banding?)

2021-08-01 Why Has Fujifilm Made No Effort Whatsoever to Deal with the Fujifilm GFX100S Horizontal White Stripes Problem?

2021-07-24 Fujifilm GFX100: Horizontal White Stripes a Problem for Numerous Images from my last trip

2021-06-01 Don’t even Think about Using the Fujifilm GFX100S for Monochrome Landscape Images — Horizontal White Stripes Make Images Unusable

2021-05-22 Fujifilm GFX100S Image Quality Defect: PDAF Pimples

2021-04-30 Fujifilm GFX100S: Unacceptable Image Quality for Monochrome Images  — Horizontal White Stripes

2021-03-29 Reader Comment: Fujifilm GFX100S and Captures for Monochrome

2021-03-27 Fujfilm GFX100S Not Here Yet, But Extensive Coverage Planned

2021-03-15 Sony A1 PDAF Banding

2021-03-15 Sony A1 Image Quality Looks Terrific, Mostly

2021-03-09 How will the Fujifilm GFX100S Fare as to PDAF Banding

2021-03-09 Sony A1 vs Sony A7R IV: Noise, Pattern Noise and Just How Poor the Analysis Tends to Be

2021-02-08 Reader Question: Convert Nikon Z7 to monochrome vs Nikon D850?

2019

2019-10-08 Nikon D850: the Last Best Camera for Monochrome?

2019-10-04 You Won’t Believe Your Eyes... Zeiss Milvus 135mm f/2 Aperture Series on Nikon D850 Monochrome: Pine Creek Mining Buildings (up to 183 megapixels)

2019-09-10 Panoramic Focus Stacking with Fujifilm GFX100: View to Mono Craters from Dana Crest

2019-08-18 Image Quality: Fujifilm GFX100 vs Fujifilm GFX 50S/R

2019-08-06 Fujifilm GFX100: Focus Stacking Examples with Fujifilm GF 23mm f/4, Fujifilm GF 45mm f/2.8

2019-08-05 Fujifilm GFX100: those PDAF Pixels Make Me Wish I Could have a GFX100 Without Them

2018

2018-10-01 With Suggestions of Pattern/Banding Noise in the New Nikon Z7, It Might Make Sense to RENT Before Buying

2016

2016-09-19 Olympus OM-D E-M1 Mark II: Major Improvements and New Features

2016-05-01 EVF Mirrorless vs DLSR

2013

2013-07-31 Is the Full Frame DSLR the New Medium Format? What do DSLRs Lack?

2013-07-24 Micro Four Thirds vs APS-C: Size and Weight Realities

2013-04-24 Reader Comment: Autofocus Accuracy

2012

2012-07-09 Errors with Nikon Contrast-Detect Autofocus