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Knight Optical(UK) Ltd - - +44 (0)1622 859444

Gelatine neutral density filters

What are you looking for in Stock?

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.  Gelatine neutral density filters work by absorption so care must be taken to avoid overheating which can lead to damage to the filter.  Gelatine 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 gelatine type.

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Part No. Density @ 546nmTrans (%) @ 546nmLength
FNP0250 Download 0.2635050 £29.95
FNP0350 Download 0.3505050 £29.95
FNP0450 Download 0.4405050 £29.95
FNP0550 Download 0.5325050 £29.95
FNP0650 Download 0.6255050 £29.95
FNP0750 Download 0.7195050 £29.95
FNP0850 Download 0.8165050 £29.95
FNP0950 Download 0.9135050 £29.95
FNP1050 Download 1105050 £29.95
FNP2050 Download 215050 £29.95
FNP4050 Download 40.015050 £29.95
FNP3050 Download 30.15050 £29.95
FNP0150 Download 0.1795050 £29.95

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