Celestron Echelon 20x70 Porro Binoculars with 20x Magnification & 70mm Objective LensNot 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 large aperture Echelon Series