USES AND MANUFACTURE OF FRESNEL LENSES

Abstract

Many aspects of Fresnel lenses are probably well known, but in recent years the uses of Fresnel lenses have been widening, and we wish to discuss these widening uses from the production point of view. Many people think of loupes when Fresnel lenses are mentiond. The first commercial products using Fresnel lenses which we were able to lay our hands on, were the field of vision lenses of twin lens reflex cameras. The use of Fresnel lenses was an epoch making technical innovation, by which every corner of the focal screen became clear. At the same time businesses opened which offered to fit Fresnel lenses as an option in twin lens reflex cameras without Fresnel lenses. Now they have become indispensable as focus plates for single lens reflex cameras and 4 × 5 inch large cameras.