FND-50C02-60 50 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

OptoSigma's FND-50C02-60 is a high-quality Neutral Density Filter, designed for use in the visible light spectrum, specifically between 400-700nm. This unmounted filter boasts a 50 mm 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 features a reflective coating on both the front and back surfaces, identified as 'opt fnd-60'. This coating is designed to provide a neutral density effect, reducing the intensity of light without altering its color balance. This can be particularly useful in situations where excessive light levels could otherwise cause overexposure or other issues.

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