Archives for August 2017

I’m going to set aside the development of the lens test using the SIemens Star target to explore something that came up in the last few days while I was messing around with the camera simulator: the effect of fill factor on sharpness and aliasing. The reason why this is topical is the Fujifilm GFX… [Read More]

This is a continuation of  —  and a sidebar to — the development of a simple, relatively foolproof, astigmatism, field curvature, and field tilt test for lens screening. The first post is here. I took the simulator and set it up for a camera with a 5.3 um pitch, 60% fill factor, and a diffraction-limited lens…. [Read More]

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. In the previous post of this series, I simulated the “pillows” that appeared in the Siemens Star images made with the Fuji GFX 50S and the Fuji 110/2… [Read More]

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   This post is a major correction to the 8/18 post that I have now withdrawn because of a modeling error — some defocus that I thought I’d… [Read More]

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!