14NDF-40-3 50.8 x 50.8 mm Unmounted Absorptive Neutral Density Filter; OD 0.4 400-700nm

This product is a 14NDF-40-3 Neutral Density Filter, offered by the renowned optical component vendor, Standa. The filter is designed to provide neutral density, meaning it reduces the intensity of light equally across the visible spectrum, without altering its color composition. This makes it an ideal tool for various applications where control over light intensity is crucial, such as in photography, cinematography, and scientific research.

The filter is rectangular in shape, with a width and height of 50.8 mm each, providing a substantial surface area for light interaction. It has a thickness of 3 mm, which contributes to its durability and stability. The filter is unmounted, offering users the flexibility to integrate it into their existing optical systems as per their specific requirements.

The filter's coating is a key feature. Both the front and back surfaces are coated with Sta 14ndf-0.4, a specialized coating that enhances the filter's performance and longevity. This coating is designed to maintain the filter's neutral density characteristics across the wavelength range of 400-700 nm, which covers the entire visible light spectrum.

The filter's geometry and shape are also noteworthy. It follows a Thin Lens shape, which is optimized for minimal optical aberrations and distortions. This, coupled with its absorptive nature, makes the filter an excellent choice for applications that demand high-quality, consistent light reduction.