Generally rectangular prism for bending or redirecting the light path of the image at 90 degrees. This produces an image of a left hand, according to the direction of the prism, the image may be inverted, it may be reversed. Rectangular prism may also be used in combination image / beam displacer

Focal length: ± 5mm - ± 1000mm ± 1%
OD: 5mm - 200mm ± 0.1mm
Center thickness tolerance: ± 0.05mm
Center deviation: ≤ 3 min
Surface accuracy: λ / 4 @
Surface quality: 40/20
Effective aperture: 90%
Coating: antireflection film, splitting film, reflective film