The 13-185 is a Neutral Density Filter by Hoya, available from Edmund Optics. This absorptive filter, with a catalog number of 13-185, is designed for use in the near-infrared spectrum, specifically at a wavelength of 588nm.
The filter boasts a circular shape, with a diameter of 50mm and a thickness of 2mm, making it compatible with a wide range of optical systems. The 13-185 filter is coated on both the front and back surfaces with EDM 13-151, a coating that enhances its performance and durability.
This filter is part of the EDM UVFS MAL-1965 material family, which is known for its high-quality optical properties. The filter is designed to provide a neutral density of 0.5, which is equivalent to an optical density (OD) of 0.5. This means it reduces the intensity of light passing through it by a factor of 10^0.5, or approximately 3.16.
The 13-185 filter is designed for use in the 600-1050nm range, making it suitable for a wide range of applications in the near-infrared spectrum. It is currently in stock and available for purchase through the Edmund Optics website.