The 50G02AV.1 Circular Variable Metallic ND Filter is a circular variable metallic neutral density filter, made of BK7 glass. It is 127 mm in diameter with surface flatness of ≤1λ , and coated for an OD range of 0.05-2.0. Our circular variable neutral density filters are designed to simplify attenuation and beamsplitting in the visible to NIR. The variable attenuation and beamsplitting around a 270° circle is achieved by a thin, reflective aluminum film. A broadband, visible AR coating on the back side allows the filter to be left in the beam path at all times with minimal losses or ghost images.
| Model | 50G02AV.2 |
|---|---|
| Type | Circular Linear Variable ND Filters |
| Diameter | 5.0 in. (127.0 mm) |
| Thickness | 0.38 in. |
| Material | BK 7 |
| Surface Quality | 30-10 scratch-dig |
| Surface Flatness | ≤1λ |
| Optical Density | 0.05-2.0 |
| Diameter Tolerance | +0/-0.25 mm |
| Thickness Tolerance | ±0.38 mm |
| Clear Aperture | From 33 mm to 101 mm diameter |
| Damage Threshold | 75 W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at the specified wavelength, typical |
| Optical Density Tolerance | ±0.20 over 270° at 0° AOI, density increases in a counterclockwise direction |
| Inside Diameter | 25.4 mm |
| Chamfers | 0.50–1.52 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
