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the last word

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

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Archives for 2018

Cross-polarization demo

May 12, 2018 JimK 11 Comments

I’ve been using cross-polarization in some of my studio work lately, and some have asked me about the benefits of this approach. In order to demonstrate them, I’ve created my first animated GIF. This is an a7III shot, using the CV 65/2 Apo-Lanthar and cross-polarized light. I set up a Godox 600 TL Pro strobe with… [Read More]

The Last Word

How I spend my time

May 11, 2018 JimK 6 Comments

Dorothy Parker is enshrined in literary apocrypha as saying, after being asked if she liked to write, “No, but I like to have written.” It turns out that, if she ever said it at all, several lesser-known writers beat her to the punch. Last week I got to thinking about how I’m spending my time…. [Read More]

The Last Word

Sony a7III PDAF striping – FAQs

May 2, 2018 JimK 11 Comments

Since this post about the Sony a7III PDAF striping, I haven’t written anything on this blog about the issue. That’s not because I haven’t been on the case. I’ve been working understanding what’s going on all this time. But, because the effect is so variable, hard to quantify, and varies with what seems like everything… [Read More]

a7III, a7RIII, a9

Sony A7III testing – and tribalism

April 24, 2018 JimK 20 Comments

I’ve said that I wasn’t going to test the Sony a7III. The testing I do takes a while, do I need to purchase cameras I test, and I don’t see much of a place for the a7III in my own photography since I already have an a9 and an a7RIII. But working with files that… [Read More]

a7III

Light painting with the GFX 50S — a demo

April 22, 2018 JimK 3 Comments

Yesterday I reported on using the Fuji GFX 50S  and the Fuji 120 mm f/4 macro for focus stacking. One of the images was of this lily:   Now I’m going to show you another thing I’ve been doing with the same subject, lens, and camera.  Here’s the setup: I’m using two lights for most… [Read More]

GFX 50S

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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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  • Geofrey on Calculating reach for wildlife photography
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  • Mike MacDonald on Your photograph looks like a painting?
  • bob lozano on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • JimK on Goldilocks and the three flashes
  • DC Wedding Photographer on Goldilocks and the three flashes

Archives

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Unless otherwise noted, all images copyright Jim Kasson.