Caliber | 37mm to 86mm | Brand Name | FOWO |
Model Number | ND64 | Type | Neutral Gray Filter ND64 |
Place of Origin | Jiangsu, China | Material | B270 optical glass |
Coating | waterproof, oil-proof, scratch-resistant | Shape | Round nd filter |
Thickness | 1.6+/-0.1mm | Frame thickness | 3.1mm |
Edge Finish | Ground and beveled | Surface Quality | 60-40 scratch-dig |
Parallelism | u22643 arc min (u22640.9 mrad) | Transmistance | >85% |
Clear Aperture | >90% of central diameter |