Image field curvature - Flattener lenses

Image field curvatureThe image produced by a lens objective has a spherical error by nature. This error can be corrected using appropriate optical elements. " More info or aberration in optics

The picture, which was taken by a Lens lens generated has by nature a spherical error. The so-called image field curvature or Aberration.

Depending on the quality of the binoculars, this results in a more or less less pronounced blurring of the picture.

Flattener lenses for error correction

This error can be corrected by appropriate optical elements - this is referred to as a "Flattener".

These flatteners often also have a Influence on the focal length. One disadvantage is the reduced field of view.