Penta Prisms


Penta Prisms – Deviation

A five-sided prism containing two reflecting surfaces at 45° to each other, and two perpendicular faces for the entering and emerging beams. A Penta prism has five sides, four of which are polished. Two reflective sides are coated with metal or dielectric HR coating and these two sides can be blackened. The deviation angle of 90deg will not be changed if the penta prism is slightly adjusted, this will be convenient to install it. It is widely used in laser level, alignment and optical tooling.The reflecting surfaces of this prism must be coated with a metallic or dielectric reflective coating. An incident beam can be deviated by 90 degree and it does not invert nor revert the image.

Material Properties


Deviate the ray path by 90°.
Image is right-handed.


Visual targeting, projection, measurement, Display systems.

Common Specifications


Transmission Regions & Applications

Parameters Ranges & Tolerances
Substrate Material N-BK7 (CDGM H-K9L)
Type Penta Prism
Surface Dimension Tolerance ± 0.20 mm
Angle Standard ± 3 arcmin
Angle Tolerance Precision ± 10 arcsec
90° Deviation Tolerance < 30 arcsec
Bevel 0.2 mm x 45°
Surface Quality (scratch-dig) 60-40
Clear Aperture > 90%
Surface Flatness < λ/4 @ 632.5 nm
AR Coating Reflecting surfaces: Protected Aluminum / Entrance and exit surfaces: λ/4 MgF2

If your project demands any prism we are listing or another type such as littrow prisms, beamsplitter penta Prisms, half-penta prisms, porro prisms, roof prisms, schmidt prisms, rhomhoid prisms, brewster prisms, anamorphic prism pairs, pallin broca prisms, light pipe homogenizing rods, tapered light pipe homogenizing rods, or a more complex prism, we welcome the challenge of solving your design needs. .