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the last word

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

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Archives for December 20, 2013

Leica WATE on the Sony a7R — crops

December 20, 2013 JimK 2 Comments

This post has the 1:1 crops from the Leica WATE on the Sony a7R images referenced in the preceding post. Center, 16 mm, f/4: Center, 16 mm, f/8: Center, 18 mm, f/4: Center, 18 mm, f/8: Center, 21 mm, f/4: Center, 21 mm, f/8: Upper left, 16 mm, f/4: Upper left, 16 mm, f/8: Upper… [Read More]

The Last Word

Leica WATE on the Sony a7R

December 20, 2013 JimK Leave a Comment

There’s been some interest in how the Leica 16/18/21 Tri Elmar ASPH  — aka the WATE, for Wide Angle Tri-Elmar — performs on the Sony a7R. Because it is designed with its exit pupil quite a ways from the sensor plane, there is reason to suspect that it should work well on the a7R. The… [Read More]

The Last Word

Controlling for shutter slap

December 20, 2013 JimK 2 Comments

There have been recent reports of possible shutter-induced blur with tripod-mounted a7R/50mm lens combinations at speeds as fast as 1/160 second. I’ll be testing for this later, but I’d like to assure you that that hasn’t affected the aperture series that I’ve presented so far in this set of posts. Mindful of possible shutter-slap effects,… [Read More]

The Last Word

December 2013
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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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