OptoSigma FND-30C02-70 30 mm Diameter Unmounted N-BK7 Visible Reflective Neutral Density Filter

OptoSigma's FND-30C02-70 is a high-quality Neutral Density Filter, designed for use in the visible light spectrum, specifically between 400-700 nanometers. This filter is unmounted, offering flexibility for integration into various optical systems, and has a generous 30 mm diameter, providing ample space for beam alignment and manipulation.

The filter is constructed from N-BK7 Schott glass, a material renowned for its excellent optical properties, including high homogeneity, low auto-fluorescence, and superior transmittance. The glass thickness is 2 mm, striking a balance between durability and light transmission.

The FND-30C02-70 features a reflective coating, Opt FND-70, on both the front and back surfaces. This coating is specifically designed to provide a neutral density of 70% transmittance, making it ideal for applications requiring light reduction without altering the spectral composition.

The filter's thin lens shape allows for easy integration into optical systems, minimizing the risk of vignetting and ensuring optimal light path alignment. The filter is currently in stock and available for immediate purchase through the provided weblink.