Neutral density glass filter (405 - 890 nm)

for checking photometric accuracy in the Vis range

Hellma Analytics neutral density glass filters are made from filter materials produced by Schott AG, which were selected on account of their homogeneity and stability. Thanks to a relatively constant transmittance within the wavelength range of 405 nm to 800 nm, they have been used to check photometric accuracy and linearity in the visible wavelength range (> 405 nm) for decades.

Please note, the thickness of the filter is set at the manufacturing so that the specified nominal optical density (values from 0.04 to 3.0 Abs) obtained at 546.1 nm. This results in slightly increasing absorptions at shorter wavelengths.

Typical spectrum for Neutral density glass filters F390 - F303 im Bereich von 405 - 800 nm, measured with a slit width of 1 nm.

Absorbance table of Neutral Density Glass Filters F390 - F303

typical absorptions at standard wavelengths

Type Art.-No. 440 nm 465 nm 546.1 nm 590 nm 635 nm
F390 666F390-25 0.0379 0.0376 0.0370 0.0367 0.0366
F2 666F2-39 0,2668 0.2416 0.2525 0.2915 0.2944
F201 666F201-39 0.3161 0.2864 0.3016 0.3502 0.3554
F3 666F3-38 0.5457 0.4970 0.5050 0.5604 0.5513
F204 666F204-37 0.7551 0.7012 0.7036 0.7187 0.7229
F4 666F4-37 1.0935 1.0058 1.0025 1.0645 1.0225
F202 666F202-36 1.6636 1.5350 1.5066 1.5424 1.4525
F203 666F203-36 2.1721 2.0105 2.0023 2.0478 1.9275
F301 666F301-361 2.6678 2.4856 2.5089 2.5443 2.3797
F303 666F303-361 3.1876 2.9692 2.9956 3.0378 2.9046

Type Article-No. Content
F390 666F390-25 F390: Optical Glass BK7 (0.04 Abs)
F2 666F2-39 Neutral Density Glass NG11 (0.25 Abs)
F201 666F201-39 Neutral Density Glass NG11 (0.3 Abs)
F3 666F3-38 Neutral Density Glass NG5 (0.5 Abs)
F204 666F204-37 Neutral Density Glass NG4 (0.7 Abs)
F4 666F4-37 Neutral Density Glass NG4 (1.0 Abs)
F202 666F202-36 Neutral Density Glass NG3 (1.5 Abs)
F203 666F203-36 Neutral Density Glass NG3 (2.0 Abs)
F301 666F301-361 Neutral Density Glass NG9 (2.5 Abs)
F303 666F303-361 Neutral Density Glass NG9 (3.0 Abs)
F0 666F0-71 empty frame (without glass), reference filter
Standard Certification F390 - F303 Wavelengths: 440, 465, 546.1, 590, 635 nm
Slit width: 1 nm; with DAkkS calibration certificate
Possible Certification all wavelengths from 405 to 890 nm possible. - Over 890 nm is also possible with Hellma Analytics calibration certificate.
Slit widths: all up to 5 nm

 

Note

If you have several Neutral density glass filters with different nominal absorbances, you can check the linearity of your absorbance scale by plotting the absorbance values measured for each wavelength against the measurement values on the DAkkS calibration certificate in a diagram.

Reference Materials (Brochure)

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Contact/Inquiry

Hellma GmbH & Co. KG
Klosterrunsstraße 5
79379 Müllheim
Germany

Phone: +49 7631 1821010
sales.analytics@hellma.com
https://www.hellma.com

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