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the last word

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

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Archives for April 2015

Rules of thumb for handheld shutter speed

April 8, 2015 JimK 12 Comments

When you first learned about photography, right along with the Sunny Sixteen rule, I’ll bet you learned this one: When shooting hand held, set the shutter speed to at least as fast as one over the focal length of the lens. That rule was originally promulgated for 35mm cameras. Should you scale the shutter speed… [Read More]

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Teapot

April 4, 2015 JimK 1 Comment

One of the things I’ve been doing while I’m sick and can’t get out much is making a few images of a teapot on the drain board in my kitchen.        

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Sony a7II precision in continuous low

April 3, 2015 JimK 2 Comments

I’ve reported before that the Sony alpha 7 cameras — the a7, a7R, a7S, and a7II — change their raw digitizing precision from 13 to 12 bits when the shutter drive mode is changed from single shot to continuous mode. I have speculated that the reason they do that is to increase the frame rate…. [Read More]

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1968 Laguna Seca USRRC — turn 9

April 2, 2015 JimK 4 Comments

The slowest corner at Laguna Seca is turn 11, a slightly-over-ninety-degree left that opens onto the main straight. Because there’s a fair amount on room on the outside, and you want to carry a lot of speed into the straight or you’ll pay for it for a long time, drivers often approach turn 11 with a… [Read More]

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1968 Laguna Seca USRRC — turn 6/6A

April 2, 2015 JimK Leave a Comment

There’s a famous pair of corners at Laguna Seca nicknamed “The Corkscrew”.  Today, they are turns  8 and 8A. In 1968, before the track was expanded, they were 6 and 6A. Turn 6 is a left-hander at the end of a straight(ish) section of the track that features a blind crest and turn-in. As you enter… [Read More]

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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

  • 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
  • Wedding Photographer in DC on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • JimK on Fujifilm GFX 100S II precision
  • Renjie Zhu on Fujifilm GFX 100S II precision
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • Ivo de Man on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF

Archives

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