Neutral density (by absorption) filters are designed for a flat transmission over a particular wavelength range and defined by the optical density (OD). Overall optical attenuation is a sum of optical absorption in neutral density optical glass and Fresnel reflection losses. Neutral density optical filter densities add up when used in series.

Main features

■ Optical density selection from 0,1 to 4

■ ø25,4 mm standard diameter

■ Excellent for low-power applications

■ Custom dimensions, optical densities are available upon request