... our single-point diamond turning machines, various modern optical elements of spherical ,aspherical or freely-curved surfaces ... including plastic, non-ferrous metals and optical crystals. Dualistic Diffractive Optical ElementsDualistic Diffractive Optical Elements or DOE can be made to ... Germanium and ZnS are single-diamond turned. Abnormal Optical ElementsWith off-axis way of processing or fly-cutting. ...