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the last word

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

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Archives for March 2020

Sony 20/1.8 G, 20/1.8 Nikkor S sun stars

March 31, 2020 JimK 3 Comments

This is one of a series of posts comparing the Sony 20 mm f/1.8 G lens to the 20 mm f/1.8 Nikkor S. One of the things that photographer like to do with short lenses is make sun stars. It’s not hard. You stop your lens down as far as it will go, aim it… [Read More]

a7RIV, Nikon Z6/7

Sony 20/1.8 G, 20/1.8 Nikkor S on Nikon Z7 — foliage

March 31, 2020 JimK Leave a Comment

In the previous post, I did a head-to-head test of Sony 20 mm f/1.8 G lens to the Z7 and  the 20 mm f/1.8 Nikkor S native lens with a Siemens Star target. Now I’ll do a similar test with a real-world subject. Here it is, with both lenses wide open on a Nikon Z7:… [Read More]

Nikon Z6/7

Sony 20/1.8 G, 20/1.8 Nikkor S on Nikon Z7

March 30, 2020 JimK 4 Comments

I’ve received a handful of requests to adapt the Sony 20 mm f/1.8 G lens to the Z7 and test the combination against the new 20 mm f/1.8 Nikkor S native lens in a head-to-head situation. Once I was reminded that I could use the TechArt E-to-Z adapter on the Sony, I warmed up to… [Read More]

Nikon Z6/7

Another apology

March 30, 2020 JimK Leave a Comment

Sorry, folks. This seems to be my month for Internet screwups. Yesterday, I installed a new firewall at a different IP address than I had been using for this blog. But I didn’t install the SSL certificate on the firewall. So, after the DNS changes  propagated, everybody started seeing scary warnings about the security of… [Read More]

The Last Word

Through-focus corner performance of the 20 mm f/1.8 Nikkor S

March 29, 2020 JimK 2 Comments

In the previous post, I put the 20 mm f/1.8 Nikkor S on a Z7, aimed it at an artificial star, and used the focus shift shooting (FSS) feature of the camera with a step size of 1 to move from front-focused to approximately in focus to back focused, and I composited them. In this… [Read More]

Nikon Z6/7, 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

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