A roof prism (also called a Dach prism) is in general any kind of reflective optical prism containing a section where two faces meet at a 90° angle. Reflection from the two faces returns an image that is flipped laterally across the axis where the faces meet.

A single Porro prism is the simplest type of roof prism, though in its most common application (the double-Porro configuration in binoculars) it is not used as a roof prism.

  Material:BK7 grade optical glass
  Dimension Tolerance: ±0.1mm
  Angular Tolerance: ±3Arc Min
  Surface Quality:40-20
  Surface Flatness: λ/10@632.8nm
  Clear Aperture:90% of diameter
  Protective Bevelling
  Coating:Optional(AR Coating are available)