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

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Archives for 2014

Sony a7S handling

July 15, 2014 JimK 3 Comments

I’m close to being done with the a7S review. In this post, I’ll depart from my usual objective reporting and give you an impression of what operating the camera was like. When I first got the camera, I thought of it as sort of like a Nikon D3 or D3s, both of which I loved… [Read More]

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The Sony a7S AA filter

July 14, 2014 JimK Leave a Comment

The a7R has no anti-aliasing (AA) filter. The a7 has one that’s pretty weak, and mostly operates in one direction. With its big fat pixels, the a7S would seem to be prone to aliasing. What did Sony do about that when they designed the camera? I set out to learn. I put the sharpest lens… [Read More]

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How fast is the Sony a7S silent shutter?

July 13, 2014 JimK 13 Comments

The a7S has a silent shutter mode. When running silent, the mechanical shutter is on vacation, lying back and catching Z’s while the sensor does all the work. The mechanical shutter is a rabbit, completing an exposure in 1/250 second (for shutter speeds faster than that, a slit moves across the sensor, but it takes… [Read More]

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Rangefinder lenses on the Sony a7S — summary

July 12, 2014 JimK 8 Comments

I’m about to move on from my testing to see how well various rangefinder — in my case, Leica M-mount — lenses do on the Sony a7S. Here’s what I’ve found out so far. Leica 16-18-21mm f/4 Tri Elmar ASPH — works fine at 16mm; also at 21mm. Leica 18mm f/3.4 Super-Elmar ASPH — works fine… [Read More]

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Leica 18mm Super-Elmar on Sony a7S

July 12, 2014 JimK Leave a Comment

Next up in my search for rangefinder wide angle lenses that work well on the Sony a7S: the Leica 18mm f/3.4 Super-Elmar-M ASPH. I also tested the Zeiss 21mm f/2.8 Distagon ZF.2, an F-mount lens with a  retrofocus design that shouldn’t have any angle-of-incidence problems. I don’t have an F-mount 18mm prime, or I would have… [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

  • Mike MacDonald on Your photograph looks like a painting?
  • 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
  • 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

Archives

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