The 87-566 from Edmund Optics is a Variable Beam Expander with a design wavelength of 355 nm. The lens is laser V-coated with reflectance of less than 0.25% at 355nm. This beam expander can provide a magnification of 2x to 8x and transmits more than 97.5% of light. The size of entrance aperture is 15 mm and exit aperture is 30 mm. It measures 169 mm in length, 51 mm in diameter and ideal for high power laser applications where magnification changes may be required, such as prototyping or R&D.