Symmetrical wide angle lens with improved illumination uniformity

摘要

A ten-element wide angle lens is optimized for projecting full frame images of a document at an object plane onto a photosensitive image plane. The lens has a semi-field angle greater than 38+20, a relative aperture of f/10, and a magnification range of 0.65 to 1.55. The lens is characterized by improved relative illumination, improved pupil coma, and partial cos4 illumination falloff compensation.