the last word

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A deep dive into histograms

May 14, 2023 JimK 1 Comment

Around the turn of the 20th century, Karl Pearson, an English mathematician and statistician, invented the histogram as a way of presenting data. Originally, the histogram was a kind of bar chart, with the x-axis divided into intervals — now called buckets or bins — and a bar for each bin indicating how many items… [Read More]

The Last Word

My lack of productivity

April 2, 2023 JimK 50 Comments

Some of you may have been wondering what’s happened to my productivity. No new photo test results for three months. What’s going on? I had hoped to delay the story behind that until I had good news to report, but DPR’s impending demise means that this may be the end of my time in being… [Read More]

The Last Word

The report on the CXD 90V will be delayed

January 2, 2023 JimK 3 Comments

In the last post, I said that Hasselblad was shipping me a XCD 90V lens to review. When I wrote that post, we had not worked out when I’ll be able to publish the results. No we have, and Hasselblad wants me to hold the review until they give the word. So there will be… [Read More]

The Last Word

Using the Swebo TC-1 with more bellows extension

December 10, 2022 JimK 2 Comments

The Swebo TC-1 is a nice piece of kit, but the rail and bellows only accommodate about 190 mm of flange focal distance. I can focus the Digaron HR 180mm lens from infinity to a few meters, but I can’t use longer lenses even at infinity, and I can’t get the bellows draw necessary for… [Read More]

The Last Word

First real picture with the Swebo TC-1

November 30, 2022 JimK 4 Comments

720nm IR-modded GFX 50R on the back of a Swebo TC-1, Rodenstock 180mm f/5.6 HR Digaron on the front of the TC-1, a 950 nm filter on the front of the lens. Edge burned for aesthetic reasons; the lens covers the sensor perfectly, as far as I can tell.

The Last Word

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Articles

  • About
    • Patents and papers about color
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  • Good 35-70 MF lens
  • How to…
    • Backing up photographic images
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  • Lens screening testing
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    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
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      • 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
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    • Found a problem – now what?
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    • Theory of the test
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  • Previsualization heresy
  • Privacy Policy
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  • Using in-camera histograms for ETTR
    • Acknowledgments
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    • 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 UniWB on the X2D
  • Ad Dieleman on UniWB on the X2D
  • Christer Almqvist on Specularity, part 2
  • Alan on A deep dive into histograms
  • stephen on Interim thoughts on the Hasselblad X2D 100C
  • Haitong Yu on Histograms, high contrast scene
  • JimK on Histogram example, normal-contrast scene
  • Christer Almqvist on Histogram example, normal-contrast scene
  • JimK on Nikon Z6/7 gotchas and fixes
  • William Mickols on Nikon Z6/7 gotchas and fixes

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