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the last word

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

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Archives for April 2020

A new series

April 28, 2020 JimK 11 Comments

Some of you have noted that I haven’t posted in a while, and have asked about my health. I’m fine. Well, I’m fine physically, but I’m worried about what’s ahead, as I’m sure many of you are. I have been working on a video version of the Chronography lecture I was going to give at… [Read More]

The Last Word

Sony a7RIV continuous drive mode precision

April 6, 2020 JimK 13 Comments

A reader asked a question about the Sony a7RIV.  I have a question for clarification. You use the terms “continuous mode,” “continuous compressed,” and “continuous uncompressed.” When I read the Sony A7Riv instruction manual (p.42) it uses the words “Continuous Shooting” to represent 4 different shooting speeds: “Continuous Shooting: Hi+,” “Continuous Shooting: Hi,” “Continuous Shooting:… [Read More]

a7RIV

Fuji 23/4 on GFX 50R, 20/1.8 Nikkor S on Nikon Z7

April 3, 2020 JimK 12 Comments

A reader and landscape photographer, impressed by how well the 20 mm f/1.8 performs on the Nikon Z7, asked if he’d really be much better off with the Fuji 23 mm f/4 on a GFX 50x. Let’s take a look, with the Fuji lens on a GFX 50R. Here’s the scene, with both cameras at… [Read More]

GFX 50S, Nikon Z6/7

14-30/4, 20/1.8 Nikkor S on Nikon Z7 — foliage

April 2, 2020 JimK 1 Comment

A reader asked me to test the new Nikon 20 mm f/1.8 against the 14-30 mm f/4 Nikkor S zoom when it’s set to 20 mm. Here’s my distant foliage test on the two. Here’s the scene, with both lenses wide open on a Nikon Z7:   Corner falloff is similar. Here’s the test protocol:… [Read More]

Nikon Z6/7

No Sloof Lirpa announcement this year

April 1, 2020 JimK 1 Comment

The folks at Lirpa Labs, the research arm of Sloof Lirpa, inform me that they unfortunately will have no new product announcements this year. They, like so many of us, have been working from home for the past month, and productivity has not been up to its usual standard. Those of you unfamiliar with the… [Read More]

The Last Word

April 2020
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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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Archives

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