Penta prisms
| Material | BK7 |
| Height | 5.4 - 43.3mm |
| Depth | 5 - 40mm |
| Dimension Tolerance | +0/-0.2mm |
| Flatness |
λ/2 @ 632.8mm |
| Surface Quality | 60/40 |
| Bevel | <0.25mm x 45° |
| Coatings |
Reflecting surfaces aluminized, overcoated with black paint |
| Entrance and Exit surface | Single layer MgF2 @ 550nm |