Neutral density (ND) Filters are used to attenuate incident radiation without altering its spectral distribution.The neutral density value of an ND filter is related to the transmittance by D=Log(1/T) (Optical Density:D,Transmittance:T).

 Absorption glass ND Filter:

Specifications:

Metallic Coated Neutral Density Filter:

Metallic Coated ND Filters are glass or quartz substrates with a precision metallic coating (Inconel) that provides uniform attenuation across a wide spectral range.

Specifications: