Archives for 2017

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’m trying to refine my off-axis test procedures with the idea of getting them posted in a single document and inviting users to try them out. I’m sure… [Read More]

Yesterday I posted a series of images of foliage as captured by a simulated camera with fill factors varying from 1% to 100%. The aliasing artifacts of the low-fill-factor images were remarkably hard to spot. Today I’m going to do the same thing with a more demanding subject. Here it is, downsampled for the web:… [Read More]

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]