ND540B Dia. 0.5 in Unmounted Reflective ND Filter; Optical Density 4.0

The ND540B is a circular, unmounted Neutral Density Filter, boasting a diameter of 0.5 inches and a thickness of 1 millimeter. This filter is sourced from the renowned optical component manufacturer, Thorlabs, and is made from the high-quality material, N-BK7 Schott. The ND540B is specifically designed for use with a wavelength of 633 nanometers.

The filter features a reflective coating, denoted as 'tho nd40', on both the front and back surfaces. This coating provides an Optical Density of 4.0, making it highly effective at reducing light intensity without altering the color composition of the incident light. This feature is particularly beneficial in high-intensity lighting environments, where it is crucial to protect sensitive optical components from potential damage.

The ND540B's 'Thin Lens' shape further enhances its functionality, allowing for easy integration into various optical systems. The filter's 'in stock' status indicates its immediate availability, making it an ideal choice for users in need of a reliable and efficient Neutral Density Filter.

For more information, including pricing and purchasing options, please refer to the provided web link: https://www.thorlabs.com/thorproduct.cfm?partnumber=ND540B