13-223 12.5 mm Dia. Hoya ND-25 Absorptive Neutral Density Filter; OD 0.5 750-1550nm

This is the 13-223 Neutral Density Filter from Hoya, available through Edmund Optics. It is a circular filter with a 12.5 mm diameter and a thickness of 2 mm, designed for use in the near-infrared (NIR) region of the spectrum, specifically between 750 and 1550 nanometers.

The filter is coated with an absorptive neutral density material, which reduces the intensity of light passing through it without altering its color balance. This is indicated by its Optical Density (OD) value of 0.5, meaning it reduces the light intensity by a factor of 1.41.

The filter's coating is applied to both the front and back surfaces, identified as 'edm 13-223'. This dual-sided coating helps to minimize reflections and increase transmission, making it suitable for high-precision optical applications.

The filter is designed in the shape of a thin lens, suggesting it is designed to minimize optical aberrations and distortions. This makes it an ideal choice for applications that require high-quality, consistent image reproduction.

The filter is currently in stock and available for purchase through the Edmund Optics website, as indicated by its 'Valid - in stock' weblink status.