A Schmidt–Pechan prism is a type of optical prism used to rotate an image by 180°. These prisms are commonly used in binoculars as an image erecting system. The Schmidt–Pechan prism makes use of a roof prism section. A binocular using Schmidt–Pechan prisms can be constructed more compactly than one using Porro or Abbe–Koenig roof prisms.
Material | Optical glass |
Diameter Tolerance | +0.0/-0.1 mm |
Surface Quality | 40/20 Scratch-Dig |
Surface Flatness (Plano Side) | λ/2 at 633nm |
Surface Irregularity (Peak to Valley) | λ/4 at 633nm |
Angle tolerance | 1 arc min |