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NG1, NG3, NG4 NEUTRAL DENSITY FILTERS

Neutral density filters NG1, NG3, NG4 (also known as grey glass or grey filters) provide an almost constant degree of transmission across a large spectrum.

Application areas:

  • Adjustment of illumination
  • Measurement and calibration 
  • Verification of photometric properties

 

 

SCHOTT guaranteed values for neutral density filters

Type Reference thickness [mm] Ti (λ[nm]) Ti (λ[nm]) Ti (λ[nm])
NG1 1 < 1x10⁻⁴
NG3 1 0.06±0.02(405) 0.10±0.02(546) 0.17±0.03(694)
NG4 1 0.27±0.03(405) 0.31±0.03(546) 0.39±0.04(694)

Please do not hesitate to contact us. We are ready to offer you assistance.

For further information about the desired filters please take notice of the current SCHOTT data sheet / catalogue.