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the last word

Photography meets digital computer technology. Photography wins -- most of the time.

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Archives for December 2024

Why I use medium format

December 21, 2024 JimK 4 Comments

There was a recent survey on DPR that asked the title question and several related ones. Some of the answers were interesting, and inspired me to write this post about my reasons. First, some history. I first started using medium format in 1949. I was six years old, and my mother and father gave me… [Read More]

The Last Word

Of fidelity, photography, audio, and wine

December 10, 2024 JimK 10 Comments

On the DPR Medium Format Forum, a poster has advocated for use of the term “image fidelity” as a scalar description of photographic technical quality. He has referenced the term “high fidelity” in audio as an analog and an exemplar. I am unconvinced that this new terminology offers any advantages over the conventional term “image… [Read More]

The Last Word

December 2024
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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
    • How to shoot slanted edge images for me
  • 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 35-70 MF 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

  • Pieter Kers on Using Curves adjustment layers in Photoshop
  • Paul R on Exposure metering
  • XUE on Dark Current in CMOS Sensors: Where It Comes From, and How Cooling Helps
  • Paul R on ISO setting for raw files
  • JimK on Pixel Response Non-Uniformity: Fixed Pattern Noise in the Light
  • Jared Bush on Pixel Response Non-Uniformity: Fixed Pattern Noise in the Light
  • JimK on Fujifilm GFX 100S pixel shift, visuals
  • Christopher Roberton on Fujifilm GFX 100S pixel shift, visuals
  • JimK on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • Colin Surprenant on Averaging captures, precision effects

Archives

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