13-099 25 mm Dia. Hoya ND-40 Absorptive Neutral Density Filter; OD 0.4 425-675nm

The 13-099 is a 25 mm diameter Neutral Density Filter, manufactured by Hoya and sourced from Edmund Optics. This filter is designed to reduce the intensity of light entering a system, without altering its color balance, making it an ideal choice for applications where controlling light intensity is crucial.

The filter features an Absorptive Neutral Density (ND) coating on both the front and back surfaces, with an Optical Density (OD) of 0.4. This specific OD value corresponds to a 25% transmission of light, offering a moderate level of light reduction. The ND-40 designation indicates that this filter is most effective in the visible light spectrum, specifically between 425 and 675 nanometers.

The filter's geometry includes a diameter of 25 mm and a thickness of 2.5 mm, making it compatible with most optical systems. It boasts a Thin Lens shape, which helps minimize optical aberrations and distortions. The filter is identified by the Material ID UVFS MAL-1965.

The 13-099 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.