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the last word

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

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A more accurate lens aberration simulation — caveats

July 4, 2025 JimK Leave a Comment

A couple of weeks ago, I presented the results of a lens simulation that I wrote. That simulator ignored phase effects in the frequency domain. I have created a successor sim that used Fourier optics, and is much more accurate in presenting the results of combinations of aberrations.  But this simulator has its own set… [Read More]

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In photography, and in life, work and joy can, and should, coexist

June 30, 2025 JimK 1 Comment

One of the things that I love about photography forums is discussing things with people with whom I disagree. It’s often a learning experience, and I get to ideas that I would not have arrived at without the argument. Just yesterday, apropos of a discussion where I said that I consider cameras tools to make… [Read More]

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Choosing gear for high-magnification macrophotography

June 28, 2025 JimK Leave a Comment

For the purposes of this post, I’m defining macrophotography as imaging at greater than life size on the sensor. In my case, that means working between 2× and 5× magnification on a 33 by 44 millimeter sensor, specifically the one in the Fujifilm GFX 100 II. That is a large sensor, so 5× allows printing… [Read More]

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On constraints

June 27, 2025 JimK Leave a Comment

When I studied partial differential equations, one concept that stood out was the role of boundary conditions. These weren’t optional. They shaped the very nature of the solution. The same differential equation could describe very different phenomena depending on how the boundaries were defined. It didn’t take long before I started seeing boundary conditions in… [Read More]

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Visualising lens aberrations — two at a time, Siemens star

June 25, 2025 JimK Leave a Comment

In the past few posts, we’ve looked at the visual effects of lens aberrations one at a time. In this post, I’ll expand that to include the compound effects of allowing the aberrations to take place in pairs. In the list of caveats that I posted a few days ago, I mentioned that I am… [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
    • 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

  • JimK on Of fidelity, photography, audio, and wine
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  • AVN on Of fidelity, photography, audio, and wine
  • Markus on In photography, and in life, work and joy can, and should, coexist
  • JimK on Fuji 120/4 GF at 1:1 with tubes — visuals
  • Christopher Roberton on Fuji 120/4 GF at 1:1 with tubes — visuals
  • Pieter Kers on Visualising lens aberrations — one at a time, Siemens Star
  • JimK on Visualizing aberrations — caveats
  • Stepan Kana on Visualizing aberrations — caveats
  • Hakan Yesil on Fujifilm 20-35/4 GF distortion

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