A Dach Prism is a type of optical prism commonly used in binoculars and other optical devices. It helps to invert and revert the image, allowing users to see a right-side-up view. The design of the Dach Prism is compact, making it ideal for portable devices. There are two main types of Dach Prisms: the Porro Prism and the Roof Prism. The Roof Prism is more streamlined and is often found in modern binoculars, while the Porro Prism offers a wider field of view. Both types enhance the quality of the image seen through the device.