Diffractive Optical Element (DOE) has some different charactristics compared with conventional optical elementsuch as a lens. DOE has great potential power which can produce superior optical systems. We have developed dual-contact PF (Phase Fresnel) lens which has high diffraction efficiency in wide range of wavelengthand manufacturing robustness. We report the development of TC-E3PF (DSC 3×Tele-converter lens) as an application of dual-contact PF lens in this paper.
