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Porro Prisms

  • Porro Prism Pairs
  • Made of BAK4, BK7, UV fused silica
  • Used in periscopes, binoculars and monoculars
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Material BAK4, UVFS, N-BK7 or equivalent Dimension Tolerance ±0.2mm
Surface Quality 60/40 S/D Clear Aperture >90%
Flatness <λ/10@632.8nm Wavelength Distortion <λ/4@632.8nm
Deviation 180°±10 arc seconds Roof Angle Tolerance <5 arc seconds
Chamfer Sharp roof, other protective chamfered Coating None, Available

Porro Prisms are a kind of reflection prisms, which is designed to modify the orientation of image. By twice internal reflections, light incoming or image from the largest face will exit through the same surface. In other words, the image will rotate by 180° but not inverted. And porro prisms are often used as a pair named double Porro prisms. This kind of prisms is often used in the field of optical telescopy for modifying the orientation of images.

Hangzhou Shalom EO offers Porro prisms made of BAK4, BK7 and UV fused silica, they are widely applied in periscopes, telescopes, binoculars and monoculars.