Penta prism is an optical glass block comprising five flat surfaces, and the entrance and exit faces form a right angle. It is often used to deviate a light beam by 90 degrees without inverting or reversing the image.  The 90-degree deviation angle is a fixed value independent of the entrance angles, which renders penta prisms advantageous in operation context requiring an exact 90° deviation without the need for precise orientation of the prism. The bulk construction of a penta prism also implies it is bound to be more stable than a group consisting of two mirrors. Penta prisms are essential components in optical observation systems and measuring instruments.

Shanghai North Optics offers Custom Penta Prisms with a wide operating wavelength range from UV to IR spectrum. We provide multiple coating options including Protective Aluminum, Single layer MgF2, Multi-layer AR coating, or custom options.