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the last word

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

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Archives for 2016

Sloof Lirpa iPad accessories

April 1, 2016 JimK 1 Comment

It’s that time of year when that marvelously inventive company, Sloop Lirpa, makes some of its most significant product announcements. Here, here, and here are some of the previous great ones. Today’s announcements give us our first glimpse of a whole line of products, not just one. The genesis of most of Sloof Lirpa’s products… [Read More]

The Last Word

Nikon D5 — PRNU

March 31, 2016 JimK 3 Comments

This is part of a series of posts about the Nikon D5. The series starts here. Normally I don’t have much trouble measuring the pixel response non-uniformity (PRNU) of a camera. Set it up aimed at a white target. Light the target with a pair of LED panels set to 5000K. Add an optional 30CC… [Read More]

The Last Word

Nikon D5 — control layout

March 31, 2016 JimK Leave a Comment

This is part of a series of posts about the Nikon D5. The series starts here. We’ve seen from the dark-field measurements and the modeling of the D5 that a photographer who wants to get the most out of the camera is going to be spending a lot more time changing the ISO setting than… [Read More]

The Last Word

Nikon D5 — first pass overall modeling

March 30, 2016 JimK 3 Comments

This is part of a series of posts about the Nikon D5. The series starts here. I took all the data gathered under to protocol of the preceding post and told my model-making program to only look at the ISOs at the base of each of the D5 “sawteeth” (isoList = [100 200 400 640… [Read More]

The Last Word

Nikon D5 — first pass modeling

March 30, 2016 JimK Leave a Comment

This is part of a series of posts about the Nikon D5. The series starts here. I completed my first pass at modeling the Nikon D5.There’s a lot more to come, I’m sure. For this first run, I modeled the camera at each tested ISO independent of all the others, and ignored any suspicions that… [Read More]

The Last Word

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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

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Unless otherwise noted, all images copyright Jim Kasson.