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You are here: Home / Archives for GFX 50S

Field curvature in the Fuji GF 35-70

December 29, 2021 JimK 1 Comment

I ran Roger’s Q&D test: https://www.dpreview.com/articles/1351719699/roger-cicala-field-curvature-for-fun-and-profit         This looks really good.

GFX 100, GFX 100S, GFX 50S

No front focusing on Fuji 35-70 GF on GFX 100S

December 28, 2021 JimK 1 Comment

Some people have reported AF front focusing with the Fujifilm 35=70 GF lens wide open at close distances. I tested my copy on a GFX 100S at minimum focusing distance, using a low-contrast Siemens Star. I processed the images in LrC using the defaults except for the white balance and defeating sharpening.   It’s an… [Read More]

GFX 100, GFX 100S, GFX 50S

Fuji 35-70 GF Siemens star visuals, corner

December 26, 2021 JimK Leave a Comment

Here is a continuation of  a visual test of the Fujifilm GF 35-70 using a low-contrast Siemens star target. In the previous post I showed you center crops. In this one we’ll look at corner crops. Test conditions: Target distance 20 meters ISO 100 Manual exposure, varying the f-stops Arca Swiss CA on RRS legs… [Read More]

GFX 100, GFX 100S, GFX 50S, The Last Word

Fuji 35-70 GF Siemens star visuals, center

December 26, 2021 JimK Leave a Comment

After a long wait — Fuji prioritized customers ordering the GFX 50S II kits — I’ve received a copy of the GF 35-70 zoom. The first thing I did was test it to make sure I have a good copy, and it did fine. You can see the results here. I’ve been working on a… [Read More]

GFX 100, GFX 100S, GFX 50S

Amp glow in Fujifilm GFX 50S Mark I and II

November 18, 2021 JimK 6 Comments

A reader saw something that looked like amp glow on dark-field photographs with his new GFX 50S II. I asked for raw files in the three mains shutter modes: mechanical shutter (MS), electronic first-curtain shutter (EFCS), and electronic shutter (ES). At my request, the exposures were made at ISO 1600 at 1/10 second. I had… [Read More]

GFX 50S

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • Good 35-70 MF lens
  • How to…
    • Backing up photographic images
    • How to change email providers
  • Lens screening testing
    • Equipment and Software
    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 24-105 mm FF lens
      • Good 24-70 FF zoom
      • Good 35 mm FF lens
      • Good 60 mm lens on IQ3-100
      • Good 63 mm MF lens
      • Good 65 mm FF lens
      • Good 85 mm FF lens
      • Good and bad 25mm FF lenses
      • Good zoom at 24 mm
      • Marginal 18mm lens
      • Marginal 35mm FF lens
      • Mildly problematic 55 mm FF lens
      • OK 16-35mm zoom
      • OK 60mm lens on P1 P45+
      • OK Sony 600mm f/4
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 mm FF lens
      • Tilted 20 mm f/1.8 FF lens
      • Tilted 30 mm MF lens
      • Tilted 50 mm FF lens
      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
    • Test instructions — reading the images
    • Test instructions – capture
    • Theory of the test
    • What’s wrong with conventional lens screening?
  • Previsualization heresy
  • Privacy Policy
  • Recommended photographic web sites
  • Using in-camera histograms for ETTR
    • Acknowledgments
    • Why ETTR?
    • Normal in-camera histograms
    • Image processing for in-camera histograms
    • Making the in-camera histogram closely represent the raw histogram
    • Shortcuts to UniWB
    • Preparing for monitor-based UniWB
    • A one-step UniWB procedure
    • The math behind the one-step method
    • Iteration using Newton’s Method

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