This is a continuation of the development of a simple, relatively foolproof, astigmatism, field curvature, and field tilt test for lens screening. The first post is here. This post is a major correction to the 8/18 post that I have now withdrawn because of a modeling error — some defocus that I thought I’d… [Read More]
Hartnell Exhibition hanging completed
Gary Smith, the Gallery Director at Hartnell, just finished hanging the This Green Growing Land exhibition and made some photos of his handiwork. Thanks so much, Gary!
Fuji 32-64/4 distortion
This is the seventh post in a series of tests of the Fujifilm 32-64 mm f/4 lens on the Fuji GFX 50S. The test starts here. It occurs to me that I neglected to do the distortion testing for the Fuji 32-64 mm f/4 zoom on the Fuji GFX 50S. Let me rectify that omission…. [Read More]
Fuji 110/2 on GFX, off-axis performance
This is a continuation of the development of a simple, relatively foolproof, astigmatism, field curvature, and field tilt test for lens screening. The first post is here. The fine Siemens Stars I used in the last post were OK, but the coarse ones were too coarse. I made binary and sinusoidal stars with 40, 60, and… [Read More]
Leica 180/3.4 Apo-Telyt-R on Sony a9: field tilt, curvature, astigmatism
This is a continuation of the development of a simple, relatively foolproof, astigmatism, field curvature, and field tilt test for lens screening. The first post is here. Bart van der Wolf recommended that I use a sinusoidal Siemens Star rather than the binary one. I wrote some Matlab code and made this: There is a fine… [Read More]
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