Telecentric lenses

Telecentricity is a characteristic of certain multi-element lenses and is defined by its ability to keep the primary light rays parallel to the optical axis in either object and/or image space. KEYENCE's RZ (Real Zoom) Lenses are designed to be highly telecentric throughout most of their magnification ranges, making measurements much more accurate, even when the sample being measured is around the periphery. Telecentric lenses are also useful when constructing 3D images and when stacking multiple out-of-focus areas into a single, in-focus image.