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the last word

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

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High DR photography with the Sony a7RIV

October 25, 2019 JimK 14 Comments

This is one in a series of posts on the Sony alpha 7 R Mark IV (aka a7RIV). 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… [Read More]

a7RIV

Portrait lens selection

October 25, 2019 JimK 11 Comments

From the mailbag: I want to buy a lens in the future for portraits primarily for self portraits. Most people want portrait lenses to produce pleasant images instead of realistic ones. For this, with my facial features favor a longer focal length. But it got me wondering how far away we have to be away… [Read More]

The Last Word

Camera resolution and 4K viewing — summary

October 19, 2019 JimK 18 Comments

This is the ninth in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. When I started this series of tests, I didn’t expect it to take so long. But I’m glad I did it; I’ve learned a lot in the testing, and now… [Read More]

The Last Word

Camera resolution and 4K viewing — a7S, a7III, a7RIII, a7RIV, downsampled

October 19, 2019 JimK 9 Comments

This is the eighth in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. In the previous post, I looked at images from four cameras: a7S, 12 MP a7III, 24 MP a7RIII, 42 MP a7RIV, 61 MP I tested them all with the Sony/Zeiss… [Read More]

The Last Word

Camera resolution and 4K viewing — a7S, a7III, a7RIII, a7RIV

October 18, 2019 JimK 2 Comments

This is the seventh in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. I’m beginning to see then end of this series of posts, and am beginning to mentally write the conclusions section, but there are a couple more things I’d like to… [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.