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the last word

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

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Archives for 2019

Sony a7RIV precision in long ES exposures

October 26, 2019 JimK 6 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

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

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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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  • Štěpán Kaňa on Calculating reach for wildlife photography
  • Štěpán Kaňa on How Sensor Noise Scales with Exposure Time
  • JimK on Calculating reach for wildlife photography
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  • JimK on Calculating reach for wildlife photography
  • Geofrey on Calculating reach for wildlife photography
  • Javier Sanchez on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • Mike MacDonald on Your photograph looks like a painting?
  • Mike MacDonald on Your photograph looks like a painting?

Archives

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Unless otherwise noted, all images copyright Jim Kasson.