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. Comparison between porro prisms and roof prisms Porro Prism: Optical path turning angle: 180° (parallel and reverse beam) Porro Prism: The direction of the image: Reverse left and right (keep up and down) Porro Prism: Number of reflection: Four times (two total internal reflections ×2 prisms) Porro Prism: Effective transmission: >99% (pure TIR, no coating required) Porro Prism: Aberration type: No image rotation and slight color difference Porro Prism: Optical path length: Length (approximately 2√2× prism side length)
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