Corner-cube and constant deviation prisms

The Corner-cube Prism returns the rays that enter its aperture parallel to itself but in the opposite direction independent of its own orientation. Corner-cube Prisms depend on total internal reflection of its three reflection and therefore have high acceptance angle limitations.

The Penta Prisms deviate a beam through 90°. The deviation of a Penta Prism is independent of the prism orientation and therefore the image is neither inverted or reversed. These Penta Prisms have aluminised reflecting surfaces and very tight deviation tolerance and have metrological usages, e.g. for setting up axes accurately for right angles. Typical usages for Penta Prisms are for beam steering and range finding, surveying and alignment in an optical system.

The other types of prisms shown here employ two reflections and have similar invariance of deviation angle to tilt in one direction only. They do not cause image inversion either and there for are widely used for microscope systems etc.

Specific requirements
We can manufacture these Penta Prisms to any size at short notice so if your requirements are not listed please contact us by telephone/ fax or email: stockrequirement@knightoptical.co.uk