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Archives for June 2017

Horshack on a9 read noise anomalies

June 6, 2017 By JimK 1 Comment

Horshack on a9 read noise anomalies

This is the 13th in a series of posts on the Sony a9. The series starts here. I present today a guest post from a expert (and he is one, despite his protestations below) who has helped me solve camera puzzles over the years. Take it away, Horshack. Jim Kasson and Bill Claff have been… [Read More]

Sony a9 electronic shutter details

June 5, 2017 By JimK 10 Comments

Sony a9 electronic shutter details

This is the 12th in a series of posts on the Sony a9. The series starts here. In this post, I looked at the speed of the Sony a9’s electronic shutter. my main tool was an analog oscilloscope (my trick won’t work with a digital one). I photographed the trace as it was moved in… [Read More]

Sony a9 — multiple ADC operations?

June 5, 2017 By JimK 2 Comments

Sony a9 — multiple ADC operations?

This is the 11th in a series of posts on the Sony a9. The series starts here. Warning: this is a yet another techie post about esoteric aspects of camera sensor analysis and modeling. There is not much to learn here that applies to general photography. If you aren’t interested in these things for their own sake,… [Read More]

Sony a9 read noise anomalies

June 2, 2017 By JimK 4 Comments

Sony a9 read noise anomalies

This is the tenth in a series of posts on the Sony a9. The series starts here. Warning: this is a techie post about esoteric aspects of camera sensor analysis and modeling. There is not much to learn here that would apply to general photography. If you aren’t interested in these things for their own sake, do… [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
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 400 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 60mm lens on P1 P45+
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 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
  • 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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  • Lefteris on Improving D850 focus confirmation accuracy
  • JimK on Focus stacking with the GFX 50S — a demo
  • Arthur on Previsualization heresy
  • Arthur on Focus stacking with the GFX 50S — a demo
  • JimK on Light painting with the GFX 50S — a demo
  • Jack Hogan on Light painting with the GFX 50S — a demo
  • JimK on Previsualization heresy
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Archives

Unless otherwise noted, all images copyright Jim Kasson.