13-168 25 mm Dia. Hoya ND-25 Absorptive Neutral Density Filter; OD 0.5 600-1050nm

This is the 13-168 25 mm Dia. Hoya ND-25 Absorptive Neutral Density Filter, a high-quality optical component designed for a wide range of applications. Sourced from the renowned vendor Edmund Optics, this filter is part of their extensive catalog, known for its precision and reliability.

The filter is a Neutral Density (ND) type, which means it reduces the intensity of all wavelengths of light equally, providing a uniform attenuation without affecting the color balance. This specific model has an Optical Density (OD) of 0.5, which corresponds to a transmission of 37% (1/e) of the incident light.

The filter is designed for the Near-Infrared (NIR) region, specifically for wavelengths between 600nm and 1050nm. This makes it ideal for applications that require the reduction of light intensity in the NIR spectrum, such as infrared photography or astronomical observations.

The filter is circular with a diameter of 25mm and a thickness of 2mm, making it compatible with most optical systems. It features a Thin Lens shape, which minimizes optical aberrations and distortions, ensuring optimal performance.

The front and back surfaces of the filter are coated with EDM 13-151, a proprietary coating developed by Edmund Optics. This coating enhances the filter's performance by reducing reflections and increasing transmission, thereby improving the overall quality of the optical system.