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Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.  Gelatin neutral density filters work by absorption so care must be taken to avoid overheating which can lead to damage to the filter.  Gelatin ND filters can also be cut easily to bespoke custom sizes in your own laboratory which can be extremely useful.

Wratten neutral density gelatin filters are now being replaced by Wratten 2 type filters which are manufactured using a ridged polymer.  Wratten 2 filters are more robust and unaffected by water and moisture as gelatin type.

Dimensions:
Clear Aperture:

Density:
50x50x0.1mm
95%

± 5%

Large 300x100mm sheets available that can be cut to smaller shapes and sizes.
Stock sheets can be cut with a razor or CNC machined to unusual shapes.
Coating options from antireflective to anti-scratch.
Mounting options.

14 Items

Name Density @ 546nm Transmission (%) @ 546nm Length (mm) Width (mm) Thickness (mm) Material/Equivalent Type Price Buy
FNP0150

pdf

0.1 79 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0250 pdf 0.2 63 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0350 pdf 0.3 50 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0450 pdf 0.4 40 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0550 pdf 0.5 32 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0650 pdf 0.6 25 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0750 pdf 0.7 19 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0850 pdf 0.8 16 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP0950 pdf 0.9 13 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP09300 pdf 0.9 13 300 100 0.1 Wratten 2 ND No. 96 Filter
US$451.06
FNP1050 pdf 1 10 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP2050 pdf 2 1 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP3050 pdf 3 0.1 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92
FNP4050 pdf 4 0.01 50 50 0.1 Wratten 2 ND No. 96 Filter
US$51.92

14 Items

1

Gelatin Neutral Density Filters

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Density @ 546nm
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