Filters, Neutral Density, Colored Glass

Esco PN:

Neutral Density Filters

Neutral density (ND) filters are used to attenuate incident radiation without altering its spectral distribution. Esco manufactures two types of optic filters: Neutral Density Color Glass Filters and Metallic Coated Filters.

Neutral Density Color Glass Filters are made from Schott NG Glass Filters. These filters:

  • Can be AR coated to prevent back reflections
  • Can handle higher input energy, especially if actively cooled
  • Have Very accurate ND values, made possible by controlling the thickness of the color glass


50.8mm x 50.8mm

Dimensional tolerance

+/- 0.25 mm

Density tolerance

+/- 10% at 550nm

Surface Accuracy

<5λ per inch 

Surface Quality

60-40, scratch-dig




Fine ground and beveled


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Esco Optics is a leading manufacturer of custom and catalog optics, precision optical components, and ITAR optics in the United States.

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As the leader for military and defense optics in the United States, Esco Optics adheres to the International Traffic in Arms Regulations.

ITAR Registered & Compliant

ITAR registered and compliant, Esco manufactures ITAR optics for all of its customers with the strictest confidentiality.