BK7 Optical Glass Porro Prism
Featured Product from Changchun Yutai Optics Co., Ltd.
What are the applications of porro prisms?
Military grade binoculars and laser rangefinders.
| Comparison between porro prisms and roof prisms | ||
| Characteristic | Porro Prism | Roof Prism |
| Optical path turning angle | 180° (parallel and reverse beam) | 180° (parallel and reverse beam) |
| The direction of the image | Reverse left and right (keep up and down) | Completely upright (without mirror image inversion) |
| Number of reflection | Four times (two total internal reflections ×2 prisms) | 5-6 times (including two reflections on the ridge surface) |
| Effective transmission | >99% (pure TIR, no coating required) | 90-95% (phase correction film coating is required) |
| Aberration type | No image rotation and slight color difference | Phase error may be introduced (P-coating correction is required) |
| Optical path length | Length (approximately 2√2× prism side length) | Shorter (more compact in structure) |
