Definition of roof prism in English:

roof prism


  • 1A reflecting prism in which the reflecting surface is in two parts that are angled like the two sides of a pitched roof.

    Compare with porro prism
    • ‘Modern roof prism designs are capable of performance just as good as a comparable porro prism design, due to current technology such as phase coating and improved reflective backing materials on the prisms.’
    1. 1.1A pair of binoculars using two roof prisms, resulting in an instrument with parallel sides and objective lenses that are the same distance apart as the eyepieces.
      • ‘Zeiss pioneered many products and technologies we take for granted, such as roof-prism binoculars and anti-reflective lens coatings.’
      • ‘Focusing is similar to a traditional roof prism binocular with the right ocular adjustable and a center focus knob.’