Not all binoculars are created equal, especially when they are expected to perform well in low light conditions. Observations during twilight and at night require larger optics to collect as much light as possible, but big lenses alone are not enough to ensure a superior viewing experience. It also takes quality glass and rugged construction to keep your binoculars safe and working well for years to come. Celestron"s large-aperture Echelon series binoculars were designed for use in low light conditions. Whether you are long-range glassing across a field or valley, or gazing at the splendors of the Milky Way, a pair of Celestron Echelon binoculars will get the job done. With an exit pupil of 4.4mm, these binoculars deliver an amazing amount of light allowing you to see the most detail possible. With the next to highest magnification in the Echelon series, the 16x70 model offers great magnification for astronomy, and provides enough power to bring small subjects into view, even at long distances.