MFND-25-40 25 mm Dia. Mounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

The MFND-25-40 is a Neutral Density Filter, specifically designed for use in the visible light spectrum, with a wavelength of 550nm. This filter is manufactured by OptoSigma, a renowned vendor in the optical industry, and is available for purchase on their official website. The catalog number for this product is MFND-25-40.

This filter is mounted and features a circular design with a diameter of 25mm and a thickness of 2mm. The material used for the filter is N-BK7, a type of glass manufactured by Schott, which is known for its excellent optical properties.

The filter is coated with Opt FND-40 on both the front and back surfaces. This coating is designed to provide a high level of neutral density, which reduces the intensity of light without altering its color. This makes it an ideal choice for a wide range of applications, including photography, cinematography, and scientific research.

The shape of the filter is thin lens, which is designed to minimize optical aberrations and distortions. This ensures that the light passing through the filter remains clear and undistorted, which is crucial for many optical applications.