I am curious about the effects of CA in black and white. In particular, its role in the look of older lenses. I will confess that my objective is to pick some old lenses for 35mm, but no one in that world thinks of aberrations in a positive light.:-) I want some lenses to take the edge off my digital work. For example, this is a shot with an old 55mm f1.2 Nikon lens, at 1.2. Spherical aberration adds to the look of this image.