NE20B-A Dia. 25 mm AR-Coated Neutral Density Filter; 350-700nm; OD 2.0 AR 350-700nm

The NE20B-A is a Neutral Density Filter with a diameter of 25 mm, manufactured by Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it ideal for applications where light intensity needs to be controlled, such as in photography, cinematography, and scientific research.

The filter features an Anti-Reflection (AR) coating on both the front and back surfaces, optimized for the 350-700nm wavelength range. This coating helps to minimize reflection and scatter, thereby improving transmission and image quality. The filter's thickness is 1.4 mm, and it has a shape similar to a thin lens, which contributes to its high optical performance.

The NE20B-A is made from UVFS material, identified by the Mal-1965 material ID. This material is known for its excellent optical properties and durability, ensuring the filter's longevity and reliability. The filter is currently in stock and can be purchased directly from Thorlabs through the provided weblink.