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the last word

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

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Archives for December 16, 2013

Design changes to mitigate shutter shock

December 16, 2013 JimK 2 Comments

Lloyd Chambers has reported that the a7R shutter vibration is worse when the camera is in portrait orientation. This makes sense if the camera is mounted directly to the tripod head, or if the mounting is very close to the camera, but my guess is that for long lenses with tripod collars that the effect… [Read More]

The Last Word

Leica 90mm ‘cron on Sony a7R

December 16, 2013 JimK 1 Comment

In the previous post we did some testing that indicated that SLR lenses work well on the a7R. In an earlier post, I found some corner casts with the Leica 50mm f/1.4 Summilux ASPH that surprised me. I have not tested that lens for corner smearing; I’m waiting for the diffuser that will let me… [Read More]

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Nikon 14mm on a7R

December 16, 2013 JimK 2 Comments

The Nikon 14mm f/2.8 ED is the widest full frame Nikon prime currently available. It’s downright tiny compared to the AI Nikkor 13mm f/5.6s of thirty years ago, and a tad bigger than the 15mm f/5.6 AI of the same era.  It’s fast, with good center performance and OK corner sharpness. It’s not the first… [Read More]

The Last Word

December 2013
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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

  • CarVac on Hasselblad X2DII shadow noise analysis
  • bruce on Input-Referred Noise in Image Sensors
  • bruce on Input-Referred Noise in Image Sensors
  • JimK on More Than Exposure: Understanding Total Light on the Sensor
  • Crack on More Than Exposure: Understanding Total Light on the Sensor
  • JimK on Hasselblad XCD 100-35 on X2D II, Siemens star, corner
  • Tom on Hasselblad XCD 100-35 on X2D II, Siemens star, corner
  • JimK on Hasselblad XCD 100-35 on X2D II, Siemens star, corner
  • Christer Almqvist on Hasselblad XCD 100-35 on X2D II, Siemens star, corner
  • JimK on Hasselblad XCD 100-35 on X2D II, Siemens star, corner

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