FND-50C02-20 50 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

This is the FND-50C02-20, a 50 mm diameter, unmounted Neutral Density Filter from OptoSigma. The filter is made of N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. The filter's primary function is to reduce the intensity of light without altering its color composition, making it ideal for various applications where controlled light exposure is necessary.

The filter features a reflective neutral density coating, Opt FND-20, on both the front and back surfaces. This coating provides a uniform attenuation of light, ensuring a consistent and predictable reduction in light intensity. The coating is designed for the visible spectrum, specifically for wavelengths between 400 and 700nm.

The FND-50C02-20 has a thickness of 2mm, which is considered thin for a filter of this size. This thinness can be beneficial in applications where space is limited or when minimizing optical path length is crucial. The filter's circular shape and thin lens geometry further enhance its versatility, making it compatible with a wide range of optical systems.

According to the vendor's information, this item is currently in stock, and you can find more details, including pricing and availability, on the OptoSigma website.