65-813 50 mm Dia. Hoya ND-25 Absorptive Neutral Density (OD 0.5) Color Filter

The 65-813 is a 50 mm diameter absorptive neutral density (ND) color filter, manufactured by Hoya and distributed by Edmund Optics. This filter is designed with a 2 mm thickness and operates within the wavelength range of 400-700nm, making it suitable for a wide range of optical applications.

The filter boasts a catalog number of 65-813 and features a unique coating on both the front and back surfaces, identified as 'edm 48-526'. This coating is designed to enhance the filter's performance and durability. The filter's geometry, including its 50 mm diameter and 2 mm thickness, is shaped as a thin lens, optimized for efficient light transmission.

The ND-25 designation indicates that this filter has an Optical Density (OD) of 0.5. This means it reduces the light intensity by a factor of 10^0.5, or approximately 30%. This feature is particularly useful in applications where control over light intensity is required, such as in photography or scientific research.

The filter is currently in stock and available for purchase through the Edmund Optics website, as indicated by its 'Valid - in stock' weblink status. For more detailed information or to make a purchase, users can follow the provided weblink.