... , Imaging Systems, Laser Measurement Systems, etc.Description:Porro prism is a type of reflection prism which can be used to alter the orientation ... of an image. Light enters the large face of the prism, then hits on the roof, by total internal reflection twice ... again through the large face. An image traveling through a Porro prism is rotated by 180deg but not inverted.Specifications: Material BK7 ...