What is a zenchi prism and a zenchi mirror? There are some accessories that are often attached to the astronomical telescope.The zenchi prism is also called the zenachi mirror, which is used when observing astronomical objects near the zenchi (just above the head).If refractable, the length of the telescope may be long, and if you point the telescope near the top of the eyepiece to the lower position.If you try to see the eyepiece from this position, it becomes very difficult to observe as a challenging structure.Use the zenith prism at this time. There are prisms inside the zenith prisms that allow you to bend the incoming light right angles.This means that you can see the light that needs to peek right below in a bad position, and it is useful for astronomical observations.However, please note that the zenith prism cannot be used with reflective telescopes and some catadoptic telescopes.