Neutral density filters are made from absorptive glass. This results in a lower cost product that is somewhat less fragile compared to coated metallic ND filters. It decreases intensity of light without altering the relative spectral distribution of the energy. Absorptive ND filters also reflect far less light toward the source compared with metallic ND Filters, which may be beneficial. Nevertheless stacking a large number of ND filters can still result in excessive undesired reflection due to Fresnel surface reflection. Due to the absorptive nature of the filter glass, use with high power lasers should be avoided. We can offer the custom transmittance, dimensions and shapes. Please contact us for your need.
| Material | Neutral Density Glass |
| Size | 3-100mm |
| Optical Density | 0.04-4 |
| Optical Density Tolerance | ±4% at 546.1 nm |
| Wavelength Range | 400-900nm |
| Angle of Incidence | 0° |
| Wedge | ≤3 arc min |
| Transmission | 91.2 % at 546.1 nm |
| Size Tolerance | ±0.1 mm |
| Surface Flatness | ≤2λ at 632.8 nm over the clear aperture |
| Surface Quality | 60-40 scratch-dig |
| Clear Aperture | ≥central 90% |
| Thickness | 1-4 mm |
| Sherlan Optics | Schott | Hoya | Russia | Other |
| NS00 | NG1 | ND-0 | HC12 | ZAB00 |
| NS02 | NG9 | ND-03 | HC11 | ZAB02 |
| NS2 | NG3 | HC10 | ZAB2 | |
| NS5 | HC3 | ZAB5 | ||
| NS10 | NG4 | ND-13 | HC9 | ZAB10 |
| NS25 | NG5 | ND-25 | HC8 | ZAB25 |
| NS30 | HC2 | ZAB30 | ||
| NS50 | NG11 | ND-50 | HC7 | ZAB50 |
| NS65 | HC1 | ZAB65 | ||
| NS70 | NG11 | ND-70 | HC6 | ZAB70 |
floatry
Sales Manager
Sales01
Sales Manager