Aberration: The inability of a lens to produce a perfect, sharp image, especially towards the edge of the lens field. These faults can be reduced by compound lens constructions, and the use of small apertures.

 

Related Words

Aberration: The inability of a lens to produce a perfect, sharp image, especially towards the edge of the lens field. These faults can be reduced by compound lens constructions, and the use of small apertures.

Spherical Aberration (3rd Order): electron optical lens aberration resulting in decreased focal length for rays that are farther from the optical axis.

Chromatic Aberration: Inability of a lens to bring light from the same subject plane but of different wavelengths to a common plane of image or focus.

Spherical Aberration: Lens fault which causes loss of image definition at the image plane. Its affects are reduced by stopping down.

Aspherical Lens: Lens with a curved, non-spherical surface. Used to reduce aberrations and enable a more compact lens size.

Astigmatism: Lens aberration making a single point light source impossible to focus as a true point.

Barrel Distortion: One of the common lens aberrations, where straight lines at the edge of the field are caused to bend into the shape of a barrel.

Apochromat: Lens corrected for chromatic aberration in all three primary colors.

Achromatic: Lens system that has been corrected for chromatic aberration.

Pyrrhic: A metrical foot consisting of two unaccented syllables.