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the last word

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

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My worst camera

March 18, 2018 JimK 14 Comments

Today’s cameras are marvels. It’s hard — impossible? — to find a truly bad one that costs more than, say, a thousand bucks. And there are plethora of truly great ones, cameras with capabilities that were the stuff of science fiction a generation or two ago. Today, I’m going to tell you about the worst… [Read More]

The Last Word

Sony a7III PDAF striping vs aperture

March 16, 2018 JimK 3 Comments

It seems to be conventional wisdom (or as close as we can come to conventional wisdom about a relatively new phenomenon) that the PDAF striping in the Sony a7III only occurs at wide apertures and with fast lenses. Rishi Sanyal was kind enough to run a series of images of an overexposed circular light source with… [Read More]

a7III

a7III, a7RIII, a7II, a7SII, a9 PDAF striping

March 16, 2018 JimK 10 Comments

Rishi Sanyal of DPR made some test exposures of a centrally-positioned circular light source with several cameras: the Sony a7III, a7RIII, a7II, a7SII, and a9. In all cases, he used a Sony 85/1.8 wide open. The exposure was set to expose the light source sufficiently far so as to generate a lot of flare. I put… [Read More]

a7III, a7RII, a7RIII, a9

GFX FW 3.0 focus bracketing with the 120/4 macro

March 15, 2018 JimK 31 Comments

Fujifilm just released firmware 3.0 for the GFX 50S. One of the new features is what Fuji calls Focus Bracketing. In my opinion, it is misnamed, as it is optimized for making exposures for stacking. However, I’ll use their terminology here. It works a lot like the Focus Shift Shooting feature in the Nikon D850…. [Read More]

GFX 50S

Gone over to SSL

March 10, 2018 JimK Leave a Comment

In order to provide better security, I’ve switched both my blogs over to secure sockets layer encryption. That means, that if you type http://{either site name}, your request will automagically be redirected to https://{either site name}. You will see a reassuring icon in your browser’s URL bar. In Firefox, it’s a green padlock. and in… [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

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Recent Comments

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Unless otherwise noted, all images copyright Jim Kasson.