Inverting prisms

These Amici also known as Roof Prisms and Porra Prisms both invert an image, typically in a terrestrial telescope. The Amici Prism is a right angle prism with an added 90° roof on the hypotenuse that diverts the image through 90º, the glass that doesn’t contribute to the aperture is ground away. Amici Prisms are typically used in applications that require both 90° deflection and image erection. The Porra Prisms, used in pairs, offset the beam and are commonly used in binoculars. These are manufactured from high-index crown glass to increase the acceptance angle to 8.5°.

There are "dispersion" prisms for wavelength separation. There are "refracting" prisms for applications such as beam steering and shaping. There are "deviation" and "reflecting" prisms for range finding, image rotation and beam folding. There are also several materials and a range of coatings to choose from.

Specific requirements
We can manufacture Inverting 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

Options available
  · AR coating (see coatings)
  · Mirror Coating (see coatings)

See also
Diffraction Gratings