The roof prism deviates or deflects the image through an angle of 90 degrees. It is a right-angle prism whose hypotenuse has been replaced by a 90-degree TIR roof. Glass that does not contribute to the clear aperture has been trimmed away to reduce size and weight.
Product parameter
| Materials | Optical glass, quartz, infrared material |
| Contour Range | 0.5-500mm |
| Contour tolerance | 0/-0.02 |
| Angle Tolerance | 5 " |
| Surface Quality | 20-10 |
| Surface Flatness | N≤1, △N≤0.2 |
| Chamfer | ≤0.1 |
| Clear Aperture | > 90% |
| Coating | According to customer requirements |
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