Description
Last updated: 2026-09-23 (UTC)
| Dimension Tolerance | ±0.2mm |
| Surface Quality | 60/40 |
| Clear Aperture | >90% |
| Flatness | <λ/[email protected] |
| Angle Tolerance | <3 arc minutes |
| Roof Angle Tolerance | Up to 3 arc seconds |
| Coating | None, available |
Half Penta Prism
Half Penta prism is exactly an half cut from penta prism, it is widely used in telescope.
Roof Half Penta prism is combined by half a penta prism and a totally internally reflecting roof which is attached to one of reflective face of the penta.
