What is aberration?

Definition of Aberration

Distortion of an image from the ideal optical image is called aberration. An ideal optical image satisfies the following three conditions.

Types of Aberration

There are the following 5 types of monochromatic aberration, caused by the shape of the lens (these are called the Seidel aberrations, named after the researcher Seidel);

. . . and there are the following 2 types of chromatic aberration, caused by the material in the lens.

Types i-iii, vi and vii do not satisfy condition 1) above. Type iv and v aberrations do not satisfy conditions 2) and 3) respectively.

Pin hole Specimen Image and Light Ray Condition