Signature Nikon optical performance coupled with a proprietary BDC reticle designed specifically to maximize the range and efficiency of today's hunting crossbows. Multiple layers of anti-reflective compounds on every glass surface provide bright and vivid sight pictures, optimum light transmission and maximum brightness from dawn to dusk. BDC 60 reticle is designed for a variety of crossbow bolt, point weights and velocities, the reticle's 20-yard 'zero' provides corresponding aiming point circles for shots out to 60 and even beyond 80 yards depending upon the bolt length, weight, point weight and velocity.