Neutral Density Filter, Absorptive : FND-2520 ND Filter NG4
FND-2520 ND Filter NG4
Performance
| Optical Density: 2.0 |
| Transmission: 1% |
| Thickness: 3.8 mm |
| Size: Ø 25 mm |
Absorptive Schott glass nd filters are used to control the intensity of light and are stackable without resulting in multiple reflections. The nd glass absorbs the light within the filter. Each glass type is polished to required thickness and measured to produce the exact optical density and transmission. Custom sizes or wavelength-specific optical density/transmission can be manufactured upon request.
Specification
| Material: |
Schott ® Filter Glass |
| Dimensions: |
Ø +0.00/-0.20 mm
Squares ± 0.20 mm |
| Thickness: |
± 0.10 mm |
| Parallelism: |
Ø 12.5 mm is ≤ 3 Arc min
Ø 25 mm is ≤ 5 Arc min
50x50 mm is ≤ 8 Arc min |
| Edges: |
Fine Ground |
| Flatness: |
Ø 12.5 mm = 3 Fringes
Ø 25 mm = 5 Fringes
50x50 mm = 8 Fringes |
| Surfaces: |
60/40 |
| Optical Density: |
O.D < 1.0 ± .05 @ 546nm
O.D > 1.0 ± 5% @546nm |
