I tested the XCD 35-100 for light falloff by making 4 images rotated 90 degrees in turn, and averaging them in Photoshop. The subject was a white wall. The lens was focused at infinity. I developed the images in Lr with lens corrections turned off, converted them to monochrome, and reduced them in size so that I could show them on the web.
The 35mm image isn’t so great. The other two are acceptable.
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