![]() The Origin and manifestation of Lateral, or Transverse, CA. Lateral, or Transverse CA, occurs when the red, green, and blue colors are focused on different positions on the same focal plane, as shown in the scheme below. True Longitudinal CA is not easy to correct during editing, but it can be reduced with accurate focus and, as shown in the image above, but stepping down your lens. ![]() Here is a real life example of longitudinal CA: note how the color of the fringe changes with the focus. On the right, how this kind of CA affects the image. The scheme illustrated the origin of Longitudinal Chromatic Aberration. With longitudinal CA, red, blue and green colors are focused on different planes: if you focus on red, you will have blue halos, if you focus on blue, you will have purple fringing. The difference between the two types of CA is in the way the lens fails to focus on the different colors in a single point. The job of a lens is to focus light on a plane, the focus plane, and all the colors on a point. There are two different types of CA: longitudinal, or axial, and lateral, or transverse. When a lens cannot focus all the different colors in the same point, we have CA. In photography, lenses are made so that light decomposition (dispersion) is greatly reduced or avoided altogether.īut no lens is perfect and light dispersion can still occur, particularly with entry-level gear. When the light comes out from the prism, the colors do not “superpose” anymore, and you can see them individually, forming a rainbow. What happens when white light passes through a prism is that the different wavelengths (colors) that compose interact differently with the glass of the prism and get deflected in slightly different directions. A prism used to decompose white light in its different components (colors). You may all be familiar with the simple experiment of using a prism to decompose white light into its different components, also known as colors. 7) Conclusion What Is Chromatic Aberration?Ĭhromatic Aberration, also known as purple fringe or dispersion, is an optical aberration common in photographic lenses and refractor telescopes.Ĭhromatic Aberration (CA) is visible as colored fringes around highly contrasted edges, such as branches and buildings edges against a bright sky.
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