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You are here: Home / Archives for a7RIV

Sony a7RIV continuous drive mode precision

April 6, 2020 By JimK 9 Comments

A reader asked a question about the Sony a7RIV.  I have a question for clarification. You use the terms “continuous mode,” “continuous compressed,” and “continuous uncompressed.” When I read the Sony A7Riv instruction manual (p.42) it uses the words “Continuous Shooting” to represent 4 different shooting speeds: “Continuous Shooting: Hi+,” “Continuous Shooting: Hi,” “Continuous Shooting:… [Read More]

Sony 20/1.8 G, 20/1.8 Nikkor S sun stars

March 31, 2020 By JimK 3 Comments

This is one of a series of posts comparing the Sony 20 mm f/1.8 G lens to the 20 mm f/1.8 Nikkor S. One of the things that photographer like to do with short lenses is make sun stars. It’s not hard. You stop your lens down as far as it will go, aim it… [Read More]

Sony, Nikon 20mm f/1.8 OOF bokeh on a7RIV, Z7

March 28, 2020 By JimK 1 Comment

There are two pieces to bokeh. The first is what things look like when they are well out of focus (OOF), and the second is how the transition from OOF to in-focus happens. The second is complicated, but the first is very simple. What you see when part of the image is well OOF is… [Read More]

Nikon, Sony 20/1.8 foliage test

March 28, 2020 By JimK Leave a Comment

This is a continuation of my testing of the two new 20 mm f/1.8 lenses from Sony and Nikon. These fit E-mount and Z-mount cameras respectively, and are part of a push by Nikon for a big place in the full frame mirrorless camera (MILC) market, and a defense by Sony of its historical dominance… [Read More]

20mm f/1.8 Nikkor S initial testing

March 27, 2020 By JimK 3 Comments

It is a rare  occurrence that two rival camera manufacturers viewing for the top of one market (in this case full frame MILCs) introduce two lenses of the same focal length and aperture simultaneously. Yet that is what has just happened with the Sony 20 mm f/1.8 G E-mount lens and the Nikon 20mm f/1.8… [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
  • 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
  • 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?
  • Joseph Holmes on Choosing CoC for precision photography in practice
  • JimK on Fujifilm G lenses hotspotting at 720 nm

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Unless otherwise noted, all images copyright Jim Kasson.