Specifications:
| Substrate Materials | BK7, Fused Silica | Out Diameter | 20mm to 200mm |
| Inner Diameter | 7.5mm, 8.0mm and 8.3mm | Out Diameter Tolerance | +0.0/-0.15mm |
| Inner Diameter Tolerance | +0.15/-0.0mm | Thickness Tolerance | +/-0.1mm |
| Parallelism | 3’ | Linearity | +/-5% |
| Error of Maximum OD | +/-5% | Surface Quality | 80/50 S/D |
| Coating Area | 0 ~ 270° | Design Wavelength Range | 380nm to 2000nm (BK7) 250nm to 2500nm (Fused Silica) |
Modules or Types:
| Code | Out Diameter | Inner Diameter | OK | Substrate |
| 444-001 | 100 | 7.5 | 1 | BK7 |
| 444-002 | 100 | 7.5 | 2 | BK7 |
| 444-003 | 100 | 7.5 | 3 | BK7 |
| 444-004 | 100 | 7.5 | 4 | BK7 |
| 444-005 | 50 | 8.0 | 1 | BK7 |
| 444-006 | 50 | 8.0 | 2 | BK7 |
| 444-007 | 50 | 8.0 | 3 | BK7 |
| 444-008 | 50 | 8.0 | 4 | BK7 |
| 444-009 | 25 | 8.3 | 1 | BK7 |
| 444-010 | 25 | 8.3 | 2 | BK7 |
| 444-011 | 25 | 8.3 | 3 | BK7 |
| 444-012 | 25 | 8.3 | 4 | BK7 |
| 444-013 | 60 | 8.3 | 1 | BK7 |
| 444-014 | 60 | 8.3 | 2 | BK7 |
| 444-015 | 60 | 8.3 | 3 | BK7 |
| 444-016 | 60 | 8.3 | 4 | BK7 |
Circular ND filters provide continuously variable, linear attenuation of incident light by rotating the filter about its center. The transmitted intensity is varied as a function of the optical density range. Hangzhou Shalom EO supplies the Circular Variable ND Filters with OD1, OD2, OD3 and OD4 in Diameter 20-100mm, standard types are available for fast delivery and customized filters is available upon request.
