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.


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

λ/[email protected]

Wavefront Distortion

λ/[email protected]

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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