Whether you're tracking wildlife or taking in the view, the Celestron TrailSeeker ED 42 mm Binoculars are a great choice for everyday use. Extra-low Dispersion (ED) objective lenses help eliminate chromatic aberration and deliver sharp images, while the fully multicoated optics and BaK-4 prisms provide light transmission and vivid colors. Lightweight and waterproof magnesium alloy construction allows for long-lasting use, and the twist-up eyecups offer comfort.