Dove Prism

The Dove prism is a rotator. After the light passes through this prism, the image is reversed by about 180°. In addition, when the prism is rotated with its optical axis, the rotation angle of the image is twice the rotation angle of the prism. Metal-coated Dove prism can replace the retroreflector. The prism can be considered as a right-angle prism to remove excess right-angle parts. This reduces the weight of the prism and the internal reflection of the stray light.