Chromatic Aberration in Camera Lenses

Chromatic Aberration in Camera Lenses

  • What is chromatic aberration

  • When you are focusing an image it sometimes happens that rainbow like colors appear, fringing the edges of the subject. This defect is called chromatic, or color, aberration, and is an effect visually similar to the spreading of white light into its spectral components by a prism. It takes two forms: lateral and longitudinal.

  • Why chromatic aberration happens

  • Lateral chromatic aberration occurs when different colors of light (that is, light of differing wavelengths) form images of different sizes. Longitudinal aberration occurs when different colors of light come to a focus at different distances from the lens.

  • How to overcome chromatic aberration

  • Chromatic aberration is a basic lens fault that cannot be corrected by closing the lens aperture. In black-and-white photography, however, where the effect is to blur the image, you can increase the image sharpness by using color filters to absorb one or more of the color fringes, focusing with the filter in place (only when the filter is in place can you tell when a true focus is achieved, because otherwise all you see, at best, is an un-sharp image).

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