The term "20x80" typically refers to a type of binoculars or telescope that has a magnification of 20 times and an objective lens diameter of 80 millimeters. This means that objects viewed through these instruments appear 20 times closer than they do to the naked eye, and the larger objective lens allows for more light to enter, resulting in brighter images, especially in low-light conditions. In the context of binoculars, the "20x80" specification is popular among stargazers and wildlife observers. The high magnification is useful for viewing distant objects, while the large lens size enhances clarity and detail. However, such powerful optics can also make the device heavier and more challenging to stabilize without a tripod.