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

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More on tilted adapters

September 17, 2018 JimK 4 Comments

This is a continuation of yesterday’s post. If you haven’t read it, you should go back and take a look. It has been said about adapters and tilt: “They all convert a good copy of a lens optically into the equivalent of a bad copy of the lens. Or a great lens into a much… [Read More]

The Last Word

Lens adapters — FUD to enlightenment

September 15, 2018 JimK 7 Comments

Preface – feel free to ignore this In 1973, I left hp to join a small computer manufacturer called Rolm with the objective of designing a set of products that would get them into the telephone business. I designed a type of telephone switching system known as a PBX. I hired the engineering team, created… [Read More]

Nikon Z6/7

Exposure strategies for the Fuji GFX 50S — numbers

September 11, 2018 JimK 1 Comment

This is a part of series of posts on the Fujifilm GFX 50S   You can 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 look for… [Read More]

GFX 50S

Z mount and long lenses — practical examples

September 10, 2018 JimK 3 Comments

The question before the house is still, “Does the Z mount offer advantages over the F mount for long lenses?” Yesterday, I showed you how the Z mount and F mount interacted with very simple long lenses. It looked like the Z mount helped give the corners of the sensor a better view of the… [Read More]

Nikon Z6/7

Does the Z mount help with long lenses?

September 9, 2018 JimK 4 Comments

Some have said that the New Nikon Z mount makes things better only for short lenses, and affords no advantage for long ones. In order to test that, I constructed the following model: We are looking at the diagonal of the sensor, which is 42.3 mm. In order to get the opening available for the… [Read More]

Nikon Z6/7

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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

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