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Archives for February 2, 2018

D850 and a7RIII autofocus accuracy compared

February 2, 2018 By JimK 9 Comments

D850 and a7RIII autofocus accuracy compared

This is a continuation of a series of posts on the Nikon D850.   You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series; just… [Read More]

Sony a7RIII autofocus accuracy — summary

February 2, 2018 By JimK 11 Comments

This is a continuation of a series of posts on the Sony a7RIII.   You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series; just… [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

  • 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
  • Beverly Parks on Previsualization heresy
  • Focus stacking with the GFX 50S — a demo on GFX FW 3.0 focus bracketing with the 120/4 macro
  • JimK on Sony a7III raw filtering
  • AndrewZ on Capture One and Fuji GFX 50S focus stacking
  • AndrewZ on Sony a7III raw filtering
  • Mark on GFX FW 3.0 focus bracketing with the 120/4 macro

Archives

Unless otherwise noted, all images copyright Jim Kasson.