Design and optimization of axial length in a -1× magnification image-inverting optical system

Abstract

This paper focuses on optimizing the axial size of a -1x magnification image-inverting optical system. The objective is to shorten the distance between the object plane and the image plane. This is achieved by shifting the rear principal plane forward and moving the front principal plane backward. An inverting lens system with a focal length of 40.48 mm has been designed, achieving an object-to-image plane distance of 59.5 mm. The configuration consists of four singlet lenses, utilizing spherical surfaces in the design. The optical system achieves high image quality across the entire field of view, with MTF values exceeding 0.1 at a spatial frequency of 56 lp/mm.