![]() Transverse CA does not occur in the center of the image and increases towards the edge. ![]() It can be reduced by stopping down, which increases depth of field so that though the different wavelengths focus at different distances, they are still in acceptable focus. Axial CA occurs throughout the image and is specified by optical engineers, optometrists, and vision scientists in diopters. The two types of chromatic aberration have different characteristics, and may occur together. The ambiguous acronym LCA is sometimes used for either longitudinal or lateral chromatic aberration. Transverse aberration is typical at short focal lengths. Transverse aberration occurs when different wavelengths are focused at different positions in the focal plane, because the magnification and/or distortion of the lens also varies with wavelength. ![]() Longitudinal aberration is typical at long focal lengths. Axial aberration occurs when different wavelengths of light are focused at different distances from the lens (focus shift). ![]() There are two types of chromatic aberration: axial ( longitudinal), and transverse ( lateral). Comparison of an ideal image of a ring (1) and ones with only axial (2) and only transverse (3) chromatic aberration ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |