84-004 100 x 300 mm Kodak Wratten 2 Neutral Density Color Filter; OD 0.9 400-700nm

The 84-004 is a 100 x 300 mm Kodak Wratten 2 Neutral Density Color Filter, available from Edmund Optics. This filter is designed to reduce the intensity of light entering the optical path without altering its color composition. It is particularly useful in high-intensity lighting conditions, where it helps prevent overexposure and maintains color fidelity.

The filter boasts an Optical Density (OD) of 0.9, which corresponds to a 79% transmission of light in the spectral range of 400-700nm. This broad wavelength coverage makes it suitable for a wide range of applications, from photography and cinematography to scientific research and machine vision.

The filter is made of color glass, a material known for its excellent optical properties, including high transmittance, low absorption, and minimal scatter. This ensures that the filter does not degrade the quality of the light passing through it.

The filter's rectangular shape and thin lens design allow for easy integration into various optical systems. The geometry specifications indicate a width of 100mm, a height of 300mm, and a thickness of 0.1mm, making it a compact and lightweight component.

The front and back surfaces of the filter are coated with EDM 54-458, a coating that enhances the filter's performance by reducing surface reflections and improving transmission. This coating also provides protection against environmental hazards, ensuring the longevity of the filter.