Celestron TrailSeeker ED 10x50 BinocularThe Celestron TrailSeeker ED 10x50 Binocular is the light gathering star of the TrailSeeker ED series. Its 50mm objectives bring in 42% more light than the 42mm models. Their ED objectives reduce chromatic aberration resulting in crisper colors and better contrast. its lenses are fully broadband multi coated to reduce internal reflections over the complete optical path. The roof prisms are phase and dielectric coated, also enhancing light transmission