Porro Prism
Porro prism is a type of reflection prism which can be used to alter the orientation of an image.
Beam enters the large face of the prism, and then hits on the roof, by total internal reflection twice from the roof, the beam exits again through the large face. An image traveling through a Porro prism is rotated by 180deg but not inverted.
Beam enters the large face of the prism, and then hits on the roof, by total internal reflection twice from the roof, the beam exits again through the large face. An image traveling through a Porro prism is rotated by 180deg but not inverted.
Specifications
|
Material |
BK7 or UV Fused Silica |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Clear Aperture |
>90% |
|
Deviation |
Up to 180°±10 arc seconds or better |
|
Roof Angle Tolerance |
<5 arc seconds |
|
Flatness |
|
|
Wavefront Distortion |
|
|
Surface Quality |
60/40 scratch and dig or better |
|
Chamfer |
Sharp roof, other protective chamfered |
|
AR Coating |
None, AR coating available |
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