With large 56mm objective lenses and powerful 15x magnification the vulture hd 15x56 binocular delivers brilliant light transmission and superior low light performance a critical attribute at dawn and dusk when wildlife can be most active and the phase corrected roof prisms fully multi coated optics and the proprietary xr coatings deliver a super bright image thats sharp from edge to edge the armortek coating on all exterior lenses resists scratches and smudges