the last word

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GFX Natural Live View and raw file histograms

February 24, 2021 By JimK 1 Comment

I received a request investigate whether the histogram in the GFX cameras when the display mode is set to “Natural Live View” faithfully represented the raw histogram. Spoiler alert. It does not, at least in all circumstances. I’d never paid any attention to that mode before. I looked it up in the GFX 100S searchable… [Read More]

Diffraction and sensors

January 30, 2021 By JimK 31 Comments

A couple of days ago, a poster on the DPR MF board made a remarkable claim in response to speculation about a 100 MP X-series Hasselblad. One word, diffraction. The X1DII and X1D doesn’t have, none or perhaps very little that I’ve noticed anyway. As you might expect, I challenged that assertion: Lenses suffer from… [Read More]

Math in photography

January 29, 2021 By JimK 4 Comments

I received an interesting message today: I am at the moment studying math and chemistry (to become a teacher) and am about to start with my diploma/master thesis. I thought writing about a mathematical aspect in photography , and since you are one of the best educated people I know in that area, I wanted… [Read More]

Does repeated JPEG compression ruin images?

January 19, 2021 By JimK 8 Comments

Note: this post has been extensively revised. I keep reading assertions like this one that was just posted here: When saving and opening a JPEG file many times in a row, compression will ruin your image. I knew from hanging around with some of the IBMers working on the original JPEG standard that recompressibility with no… [Read More]

Leica 90/2 Apo-Summicron ASPH-M on GFX 50S

December 23, 2020 By JimK 2 Comments

The M-mount Leica 90 mm f/2 Apo-Summicron is a special lens. Almost as expensive as the Otus 85/1.4, it doesn’t quite measure up to the Zeiss lens in the standard lens quality metrics. But in spite of — probably because of — its optical deficiencies, it does a superb job of rendering some things. In… [Read More]

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • 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

Category List

Recent Comments

  • Maurin on Zeiss Batis 135 on Nikon Z7
  • JimK on Zeiss Batis 135 on Nikon Z7
  • Maurin on Zeiss Batis 135 on Nikon Z7
  • Scott Pilla on GFX Natural Live View and raw file histograms
  • Macro Guy on THoS: a NYT infinite loop
  • JimK on Sony 135 mm STF on GFX 50R
  • Alexander Häggström on Sony 135 mm STF on GFX 50R
  • Mike King on Metabones 1.26x Expander on GFX 100 with Otus 55
  • JimK on Diffraction and sensors
  • Barry Benowitz on Diffraction and sensors

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Unless otherwise noted, all images copyright Jim Kasson.