ND30B Dia. 25 mm Unmounted Reflective ND Filter; Optical Density 3.0

The ND30B is a circular, unmounted Neutral Density Filter, boasting a diameter of 25 mm and a thickness of 1 mm. Manufactured by Thorlabs, a leading vendor in the optical industry, this filter is made of N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties.

The ND30B filter is coated with THo ND30 on both the front and back surfaces. This coating is a type of Neutral Density coating, designed to reduce the intensity of incident light without altering its color composition. The Optical Density of this filter is 3.0, which translates to a transmission of approximately 0.1% at the specified wavelength of 633 nm.

This filter is shaped as a Thin Lens, which is a lens with a very small focal length compared to its diameter. This shape allows for minimal optical aberrations and distortions, making it ideal for applications that require high-precision optics.

The filter's status is in stock, and you can find more information about it, including its catalog number and a direct link to its product page on Thorlabs' website, in the item data provided.