Pentagonal prism group with high rotating precision

The utility model discloses a pentaprism combination with high rotation-angle-accuracy, including a pentaprism. The utility is characterized in an optical wedge included. The optical wedge is fixed on the incident plane or the emergent face of the pentaprism through bond. By sticking the adjusted optical wedge to the pentaprism, the utility is capable of correcting the first optical parallel difference; an ordinal-precision and low-cost pentaprism and a low-cost optical wedge are used to replace the high-precision pentaprism in the utility; with a simple structure and a small volume, the utility model is suitable for various kinds of measuring instruments.