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Archives for November 9, 2016

Sony a7S battery current

November 9, 2016 JimK Leave a Comment

This is a continuation in a series of posts on power consumption in the Sony a7RII. The more recent incarnation of the series starts here. The fact that the a7RII takes battery current to keep the sensor centered even when IBIS is turned off got me to wondering about two things. Do the optically stabilized… [Read More]

The Last Word

Sony a7RII battery current when charged through USB port

November 9, 2016 JimK 3 Comments

This is a continuation in a series of posts on power consumption in the Sony a7RII. The more recent incarnation of the series starts here. A reader asked me to look into the a7RII battery current with a USB charger attached. Here’s the startup cycle under those conditions with a close-to-fully charged batter attached: The… [Read More]

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Refining the a7RII battery current measurements

November 9, 2016 JimK Leave a Comment

This is a continuation in a series of posts on power consumption in the Sony a7RII. The more recent incarnation of the series starts here. I reported on my battery current measurement setup here. In the last few days, I’ve refined it somewhat, and I’d like to document what I’m doing here, because my techniques… [Read More]

The Last Word

November 2016
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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

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