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Neutral Density Filters

A thin metal layer is deposited under high vacuum on a substrate of optically polished glass or quartz in such a way that part of the incident light is transmitted, part is reflected and the rest is absorbed by the metal layer.

By specific modification of the evaporation parameters, ND-filters with different transmission values are created.

The ND- filters are classified on the basis of the transmission or the optical density of the filter.


  • Photometer
  • Detectors
  • Cameras


  • High thermal load capacity
  • Dense layers, tropicalized
  • Extremely long service life

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