| Metallic Neutral Density filters comprise a thin metallic layer on a glass or fused silica polished window. Metallic ND filters attenuate the light by reflection and thus avoid the possible heating issues with glass and gelatine neutral density filter types. However care must be taken to ensure the reflected light does not cause problemsOur stock range of visible/IR range of Metallic Neutral Density Filters are coated on low-expansion borosilicate glass substrates and cover the range from 350-2500nm. Our UV range of Metallic Neutral Density Filters are coated on UV grade fused silica and therefore cover the useful UV region down to 170nm. All Metallic ND Filters are supplied with a copy of the spectral transmittance scan taken on a filter at the time of the production coating. We stock uncoated borosilicate and UV fused silica substrates so custom Metallic filters can be supplied to your specific request, please enquire. Specifications: Options available >> Cutting down or edged to special shapes and sizes >> Mounting (25mm dia only) | 
Neutral Density Filters - Metallic Type
