The Nikon PROSTAFF Gen I features fully multi-coated lenses to boost light transmission for dawn-to-dusk performance. 1/4 MOA adjustment turrets get you zeroed-in quickly and efficiently. The Spot On optimized BDC reticle makes accurate shots to 600 yards and beyond a real possibility. Built on a 1" tube, the PROSTAFF Gen I is waterproof, fog proof, and shockproof.