click me!
  • Roof Prisms
  • Roof Prisms

Roof Prisms

  • Ray deviation of 90°
  • Optional silver coating on roof surface
  • Applications: Spotting scopes, Binoculars, Prism Diagonals, Optical instruments
Inquire Us  


Material N-BK7, UV Fused Silica, other optical glass Angular Tolerance ±3 arcmin
Surface Quality 40/20 S/D Clear Aperture >90%
Flatness <λ/10@632.8nm Roof Angle Tolerance Up to 3 arc seconds
90° Angle Tolerance ±2 arcmin or ±5 arcsec

Roof prisms or right angle roof prisms are reflective optical prisms, they contain a section where two faces meet at a 90° angle. These two 90° faces resemble the roof of a building, giving this prism type its name. Roof prisms revert and invert the image, bending sight beam by a 90°angle. In passing through the prism, the image is both deflected right-to-left and top-to-bottom. It is ideal for applications in binoculars, spotting scopes and optical instruments.

Hangzhou Shalom EO offers roof prisms made from BK7, UV fused silica and other optical glass, optional silver coating on roof surface is aslo available.