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Changchun Yutai Optics Co., Ltd.
Home > Products > Prisms > Porro Prisms
BK7 Optical Glass Porro Prism
The BK7 porro prism is a classic optical path steering element made of BK7 optical glass. It achieves 180° beam steering and left-right image inversion through total internal reflection, and is a core component of optical systems such as binoculars and rangefinders.
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What are the applications of porro prisms?
Military grade binoculars and laser rangefinders.
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) |
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