I recently had cataract surgery; two weeks ago on my left eye, and yesterday on my right. So for two weeks, I got to walk around comparing the colors with the treated versus those with the untreated eye. Cataracts are known to block short wavelengths to a greater extent than long ones, so I expected… [Read More]
Search Results for: star eater
Goals for this test
Here is what I’m trying to accomplish with this test regime. Fairly easily performable by non-experts. We’ll see how well I’ve accomplished this goal. I’ve been surprised and disappointed by the number of people who have been unable to follow the simpler instructions in my Simple Decentering Test, so I’m not totally confident. Nevertheless, I… [Read More]
What’s wrong with conventional lens screening?
There are a few methods for screening lenses that are floating around. As procedures for non-technical folks, I think they all have issues. In this page, I’ll run through some common approaches and tell you what I think are the problems. Full-frame flat target One common approach to lens testing is to use a flat… [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]
IQ effects of Fuji 23/4 distortion corrections
This is the 71st in a series of posts on the Fujifilm GFX-50S. The series starts here. In the last post, I showed you some images with Lightroom’s distortion correction enabled and disabled for the Sony 12-24/4 FE lens. Several people had expressed the opinion that correcting distortion in wide rectilinear lenses in post should… [Read More]
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