the last word

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Dr. Pratt’s developer

November 8, 2011 JimK Leave a Comment

In a previous post – you can see it here – I mentioned Dr. Pratt’s developer in passing. A web search for it yields no results. I’d like to give the formula and instructions for its use here, so that it becomes part of the collective cyber-consciousness. Dr. Pratt’s developer is a two-solution paper developer… [Read More]

Technical, The Last Word

Landscape Light

August 7, 2011 JimK Leave a Comment

No, that’s not “Landscape Lite”, as in lo-cal, dumbed-down, mindless eye candy. It’s light, as in easy-on-the-back, footloose-and-fancy-free, spontaneous, fluid, and instinctual. The key is leaving the tripod at home, and restricting your total equipment weight to five pounds or so. On a recent trip to Jackson Hole, I gave it a try. I took… [Read More]

Technical, The Last Word

Wag the dog part 7

July 11, 2011 JimK Leave a Comment

When I started putting Leica lenses on the Sony NEX-5, I assumed that just about any Leica lens was going to be a big step up from the Sony 16mm that comes with the camera (you can also get the camera with the 18-55 mm zoom). I was surprised to find image quality to be… [Read More]

Technical, The Last Word

Wag the dog, part 6

July 10, 2011 JimK 1 Comment

In Wag the dog, part 3, I pronounced the Novoflex adapter’s flange distance perfect. That seemed to be true for the Tri-Elmar, but further experimentation with other lenses shows that some focus beyond infinity to a greater or lesser degree. The errors are small and would likely not be significant in normal photography, but the… [Read More]

Technical, The Last Word

Wag the dog, part 5

July 9, 2011 JimK Leave a Comment

I decided to complete my testing of Sony and Leica lenses on the Sony NEX-5 by comparing some Leica lenses to the Sony 18-55 mm zoom. I used three Leica lenses for the comparison: The 16-18-21 mm Tri-Elmar, set at 18 mm to match the shortest setting of the Sony zoom The 24 mm f/2.8… [Read More]

Technical, The Last Word

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • Good 35-70 MF lens
  • 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

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  • JimK on Internal focusing 100ish macro lenses
  • Darrel Crilley on Fuji 100-200/5.6 on GFX, Nikon 70-200/@2.8E, Apo-Sonnar 135 on Z7, revisited

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