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Archives for June 4, 2021

Fuji GFX 100S focus bracketing doesn’t return to starting position reliably

June 4, 2021 JimK Leave a Comment

This is one in a series of posts on the Fujifilm GFX 100S. You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series;… [Read More]

GFX 100S

Cambo AC-380 fine ratio geared focus

June 4, 2021 JimK 1 Comment

I’ve been using the Cambo Actus and the HR Digaron 180/5.6 for a while. One of the things that has bothered me is how difficult it has been to focus critically. The standard focusing adjustment mechanism is just too coarse. Combo has a fix for that. Like most Cambo products, it comes at considerable cost,… [Read More]

The Last Word

Fuji 80/1.7 LoCA and MTF50 on the GFX 100S, sample points

June 4, 2021 JimK Leave a Comment

This is one in a series of posts on the Fujifilm GFX 100S. You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series;… [Read More]

GFX 100S

June 2021
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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • Good 35-70 MF lens
  • 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 Manually focusing the Fujifilm GFX 50S
  • John S on Manually focusing the Fujifilm GFX 50S
  • JimK on Scanning black-and-white negatives with a GFX 100S
  • Alessandro A on Scanning black-and-white negatives with a GFX 100S
  • JimK on Scanning black-and-white negatives with a GFX 100S
  • Alessandro A on Scanning black-and-white negatives with a GFX 100S
  • Parallax Enjoyer on Magical lenses?
  • JimK on Nikon Z7 focus shift shooting
  • JimK on Nikon Z7 focus shift shooting
  • Gregory Summers on Nikon Z7 focus shift shooting

Archives

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