Porro Prism
Porno Prism is composed of one large face and two roof faces which are mutually vertical. Beam enters the large face of the prism then hits on the roof, by total internal reflection twice from the roof, the beam exits again through the large face.

Material:                         BK7 grade A optical glass, UV grade fused silica etc.

Dimension Tolerance:     +/-0.05mm

Surface Accuracy:         λ/8 @632.8nm

Wavefront Distortion:   λ/4 @632.8nm

Beam Deviation:          <2 arc sec

Angle Tolerance:          <5 arc sec

Surface Quality:            20-10

Clear Aperture:             > 90%

Bevel:                           0.2mm×45°

Coating:                       user-defined