FND-30C02-60 30 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

OptoSigma's FND-30C02-60 is a high-quality Neutral Density Filter, designed for use in the visible light spectrum, specifically between 400-700nm. This unmounted filter boasts a 30mm diameter and a thickness of 2mm, making it a versatile choice for a variety 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 coefficient of thermal expansion and high homogeneity.

The filter's coating is another notable feature. Both the front and back surfaces are coated with Opt FND-60, a reflective neutral density coating. This coating reduces the intensity of light without altering its color, providing a neutral density effect. It's particularly useful in applications where light intensity needs to be controlled, such as in photography, cinematography, or scientific research.

The filter's thin lens shape allows it to be easily integrated into existing optical systems. It's currently in stock and available for immediate purchase through the OptoSigma website.