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When considering longitudinal CA, one must see the range of colors as a linear spectrum, rather than a circular color wheel. Infrared light with its very long wavelengths is on one end of the spectrum, ultraviolet with a very short wavelength is on the other. In between you have the visible spectrum: red, orange, yellow, green, blue, indigo, and violet in ...

0 I found this article. Apparently the color changes once you past the focal point in the photo. In the foreground it's violet (just for Stan) and green in the background. Hope this helps.


This shape together with the hardness of the lens causes light rays to be redirected, they are bent inward as they transverse the lens. This action is called refraction. The light rays are caused to trace out a shape that resembles a cone of light. The length of this cone is measured when imaging a far distance object. This distance is labeled the focal ...


The term is chromatic aberration. Is is explained in detail here: What is Chromatic Aberration?


If I understand your example correctly, the focal plane changes with color. I think what you show here is axial (longitudinal) chromatic aberration. APO lenses are not necessarily a solution here. Canon does not mark any lenses as such and as far as I know none of their macro lenses are perfectly corrected for axial CA. The lens you have is pretty good. ...


The camera lens is a converging lens. Light rays from the subject enters the lens and the lens, due to the shape and density of the glass lens, emerge tracing out a revised path. This path resembles a cone of light. We focus the camera by moving the lens forward or backward. This action adjusts the position of the apex of the cone. We want the apex to just ...


You are seeing chromatic aberration — a prismatic effect which, as you nicely illustrate, reduces sharpness even in black and white photography. A lens which has greater correction for this is called an apochromatic lens — often something like "APO" in the lens name. Note that in lenses for telescopes and microscopes, you'll often also see achromatic ...


It is only a very slight over-simplification to describe lateral chromatic aberration as the situation in which different colours produce pictures of slightly different sizes. Seen in that light, it's merely a matter of adjusting (slightly) the image size in one or more channels so that everything comes back into registration. In this article on The Online ...


Transverse chromatic aberration: The focal length a measurement, lens to image plane, when imaging a far distant subject. The camera lens is a converging lens. Light from an object at infinity enters the lens as parallel rays. The lens bends these inward. The path of the image forming rays trace out a cone. The camera is focused. This adjusts the distance, ...

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