The Nikon 7 x 50 Prostar Binocular is specially designed for use in astronomical applications. It offers an aberration-free observation that helps in viewing the star clusters and nebulas with much clarity. Moreover, the lenses are multilayer coated, which enhances the visibility of the images. One of the outstanding features of these binoculars is Nikon's high-eyepoint design that provides comfortable viewing experience even while viewing for long hours. Its waterproof and fog-proof construction makes it great for use outdoors. The optical barrel is filled with nitrogen to prevent internal fogging even when subjected to extreme temperatures. Sealed with an o-ring, it prevents moisture, dust, or debris from entering the binoculars.