ND520B Dia. 0.5 in Unmounted Reflective ND Filter; Optical Density 2.0

The ND520B is a circular Neutral Density Filter, unmounted and with a diameter of 0.5 inches, sourced from the renowned optical component manufacturer, Thorlabs. This filter is designed with a base shape of a Thin Lens, featuring a geometry that includes a diameter of 12.7 millimeters and a thickness of 1 millimeter.

The ND520B filter boasts a coating on both its front and back surfaces with the Thorlabs' ND20 coating, providing an Optical Density of 2.0. This specific coating is intended for use with a wavelength of 633 nanometers. The filter's catalog number is ND520B, and users can find more information, including up-to-date stock availability, on the Thorlabs product webpage linked in the item data.

As a Neutral Density Filter, the ND520B is engineered to reduce the intensity of incoming light, regardless of its wavelength, without altering the light's color composition. This filter is an essential component for various applications, such as managing high-intensity light sources, controlling exposure in imaging systems, and conducting experiments requiring precise light intensity modulation.