This DIY is an astronomical telescope mirror that comes with a 160mm primary mirror and 1300mm focal length. It offers a maximum possible magnification of 300X which helps to see binary stars and fine planetary and lunar details. This mirror has a reflectivity of 400 - 950mm and has an ultra-wideband coating that is customized for each lens in the optical path to ensure the best possible light from the front glass to the eyepiece.