FND-50C02-40 50 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

The FND-50C02-40 is a high-quality Neutral Density Filter, unmounted, with a 50 mm diameter and a thickness of 2mm. This filter is designed for use in the visible spectrum, specifically between 400-700nm, making it suitable for a wide range of optical applications.

The filter is made from N-BK7, a type of borosilicate glass manufactured by Schott AG, which is known for its excellent optical properties. This material is often used in high-precision optical systems due to its low dispersion and high homogeneity.

The filter features a reflective coating, Opt FND-40, on both the front and back surfaces. This coating is designed to reduce the amount of light that passes through the filter, providing a neutral density effect. The coating is consistent across both surfaces, ensuring that the filter maintains its properties when used in a variety of configurations.

The filter's shape is described as a Thin Lens, which suggests that it has been designed to minimize optical aberrations. This makes it an ideal choice for applications that require high optical precision.

The filter is available from OptoSigma, a leading vendor in the field of optical components. According to the vendor's information, the filter is currently in stock, indicating that it is readily available for purchase and use.