Definition of roof prism in English:

roof prism

noun

  • 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. 1.1roof prisms A 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.’