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the last word

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

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Archives for 2020

How focus-bracketing systems work

June 28, 2020 JimK 19 Comments

I’ve done a lot of testing of the focus bracketing (Fujifilm’s name for it), and focus-shift shooting (Nikon’s) on the GFX 50S, the GFX 100, the Z7 and the D850. I expected that the users of these systems would  be people who did focus bracketing or focus-shift stacking manually, and they wanted some way to… [Read More]

GFX 100, GFX 50S, Nikon Z6/7

Photography and trade-offs

June 20, 2020 JimK 11 Comments

Some time ago, looking for a way that math-averse photographers can figure out what focus-bracketing step size to use with the GFX 100, I posted this. Yesterday, I received a question from a reader: … I’m a bit flummoxed by your asking “how much out of focus is acceptable” re the star target images.  My… [Read More]

The Last Word

Picking a camera is like picking a dog?

June 3, 2020 JimK 15 Comments

On one of the DPR fora, a photographer was saying that amatuers should pick their cameras for their ergonomics, since all of today’s cameras are capable of making great images. He compared buying a camera to going to the shelter to choose a dog, and said you need to get the one that speaks to… [Read More]

The Last Word

Dancing flowers and grasses

May 25, 2020 JimK 6 Comments

A few weeks ago, I showed  you some images I’ve been making in my studio by shining light through a Japanese bamboo sculpture. Last summer, I had been creating some heavily manipulated images by writing computer programs to perform distortion and fusing of conventional still photographs. I set that aside when I got involved with… [Read More]

The Last Word

Two digital camera color fallacies

May 16, 2020 JimK 25 Comments

Recently I’ve seen two kinds of posts that share the same fundamental flaw. This is not the first time I’ve seen either of these mental errors in action, and I’m sure it won’t be the last. I’ve had a hard time getting some of the people making the errors to see what’s wrong with their… [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

  • JimK on How Sensor Noise Scales with Exposure Time
  • 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
  • Geofrey on Calculating reach for wildlife photography
  • 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.