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You are here: Home / 2015 / August / Archives for 21st

Archives for August 21, 2015

Sony a7RII LENR at ISO 100

August 21, 2015 By JimK 6 Comments

Yesterday we saw that the Sony a7RII long exposure noise reduction (LENR, aka dark-frame subtraction) is applied at shutter speeds so short that it hurts the engineering dynamic range of the image. That experiment was performed at ISO 3200. It just didn’t seem right that the Sony engineers would do something like that. To be… [Read More]

August 2015
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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
  • 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 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 Shutter shock in the GFX 100s
  • Ilya Zakharevich on Shutter shock in the GFX 100s
  • JimK on Shutter shock in the GFX 100s
  • Christopher Hauser on Smallrig GFX 100S L-bracket
  • Erik Kaffehr on Shutter shock in the GFX 100s
  • JimK on Fuji 80/1.7, 110/2 chromatic aberrations compared
  • Alan on Fuji 80/1.7, 110/2 chromatic aberrations compared
  • Rico Pfirstinger on Smallrig GFX 100S L-bracket
  • JimK on How fast is the GFX 100S electronic shutter?
  • Nakamori_C on How fast is the GFX 100S electronic shutter?

Archives

Unless otherwise noted, all images copyright Jim Kasson.