Penta Prism
An incident beam can be deviated by 90 degree without inverting or reversing through a Penta prism. Penta prism has five sides, four of them 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.

The penta prism is including roof penta prism, beamsplitter penta prism, half penta prism and roof half penta prism. The material of penta prism is usually used BK7,  maybe you hope use another one, please tell me when you send our E-mail.



BK7 Grade A optical glass


From 7x7mm to 25.4x25.4mm

Dimension Tolerance


90°Deviation Tolerance

Up to 5 arc seconds


Up to λ/4 @632.8nm


Dielectric reflective coating
R > 95% per face from 630 to 680 nm

Surface Quality

60/40 scratch and dig

Clear Aperture




Note: Atoptical can provide custom made prism. Please contact us for details.