Fisheye lenses are generally designed as systems, characterized by a large negative front group and a positive rear group.
Photographic fisheye lens design for the represents a specialized branch of optics that prioritizes an extreme field of view (FOV), typically 180° or more, over the correction of rectilinear distortion. Unlike standard wide-angle lenses that aim to keep straight lines straight, fisheye lenses utilize uncorrected barrel distortion to map a hemispherical scene onto a flat rectangular sensor or film plane. 1. Core Optical Principles PHOTOGRAPHIC FISHEYE LENS DESIGN FOR 35MM FORMA...