the last word

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

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From Tortoise to Hare

January 10, 2009 By JimK Leave a Comment

Over the last year, you may have noticed the performance of this blog diminishing: pages taking longer to load, timeouts, and the navigation tools not loading properly.  If you’re a diligent reader, at the end of December you saw a complete outage for about a day. Since then, performance has increased markedly. Pages load crisply,… [Read More]

Two new films

December 26, 2008 By JimK Leave a Comment

I re-read yesterday’s post and it seemed like a downer, so I’ll post some good news on the film front. Kodak has come out with a new film called Ektar 100, which they claim has the sharpness and grain structure of the old Ektar 25, with two stops higher speed, and more latitude (it would… [Read More]

Tossing out the film

December 25, 2008 By JimK Leave a Comment

Today my wife asked me to get some ice for Christmas dinner from the freezer in the garage. While I was doing that, I noticed a big stack of film that had been sitting in there for years. I gathered it up into a paper bag. 220 rolls of Tri-X and Portra 160. 4×5 Ready-Loads… [Read More]

Other people’s blind spots

December 6, 2008 By JimK Leave a Comment

It’s bad enough that you get trapped by your own blind spots, but it gets worse: it’s all too easy to become the victim of somebody else’s. A couple of months ago, I suggested that workshops were a good way to see how other people do things, and perhaps discover the existence of mental door… [Read More]

Knowing too much

November 8, 2008 By JimK Leave a Comment

Last month I wrote about blind spots. I’d like to take another shot at the subject, but from a different angle. Before I attained the exalted status of full-time photographer-and-general-layabout, I was an electrical engineer. I worked in different areas: speech recognition, data acquisition and process control, telephone systems, data networking, control networking, and color… [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
  • 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

  • JimK on Detectability of visual signals below the noise
  • JimK on Does repeated JPEG compression ruin images?
  • Bill Claff on Detectability of visual signals below the noise
  • Mike B on Does repeated JPEG compression ruin images?
  • Robert Frangioso on Leica 280/4 Apo-Telyt R on GFX 50R in infrared
  • Robert Frangioso on Why so few posts?
  • Ken on Noise reduction and downsampling
  • Robert Kuechle on Chronography video up
  • JimK on Leica 90/2 Apo-Summicron ASPH-M on GFX 50S
  • DanB on Leica 90/2 Apo-Summicron ASPH-M on GFX 50S

Archives

Unless otherwise noted, all images copyright Jim Kasson.