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the last word

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

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Archives for July 20, 2025

Visualizing lens aberrations, one at a time, revisited

July 20, 2025 JimK 8 Comments

I have now constructed a more accurate lens simulator than the one I talked about last month. The new one takes phase effects into account, and uses 31 wavelengths between 400 and 700 nanometers on 10 nanometer spacing instead of three wavelengths. This is the first post with images from the simulator. When analyzing the… [Read More]

The Last Word

Bob Dylan reviews the Fuji 110mm f/2 GF lens

July 20, 2025 JimK 1 Comment

A haze hangs like velvet where daylight just died,And the lens on the table still hums like a lie.The model’s half laughing, the lights start to fade,But the Fuji stays sharp in the world it unmade.You focus, you wait, you forget what you knew.It gives you what’s there and it steals what is true.The background… [Read More]

The Last Word

July 2025
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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

  • Dom on Exposure strategies for the Fuji GFX 50S — numbers
  • JimK on Exposure strategies for the Fuji GFX 50S — numbers
  • Dom on Exposure strategies for the Fuji GFX 50S — numbers
  • CarVac on Hasselblad X2DII shadow noise analysis
  • bruce on Input-Referred Noise in Image Sensors
  • bruce on Input-Referred Noise in Image Sensors
  • JimK on More Than Exposure: Understanding Total Light on the Sensor
  • Crack on More Than Exposure: Understanding Total Light on the Sensor
  • JimK on Hasselblad XCD 100-35 on X2D II, Siemens star, corner
  • Tom on Hasselblad XCD 100-35 on X2D II, Siemens star, corner

Archives

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