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]
Archives for August 2017
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]
Sony 70-200/4@200mm on a9: tilt, field 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. I wanted to see what happened if I did my test with a lens that wasn’t particularly sharp on a camera with a lower=resolution sensor and and an anti-aliasing (AA)… [Read More]
When self-imposed limitations are bad for your photography
In this post and others, I have long argued for the virtues of setting limits for yourself as you work on a project. The idea is that constrictions narrow your focus so that you have to wrestle with difficulties that you would otherwise skirt, solve problems that you would otherwise ignore, and all that triggers… [Read More]