Boasting Nikon's fully multicoated optical system and a versatile 4 to 12x magnification range, the ProStaff 4-12x40 riflescope helps put virtually any shot in your comfort zone. The scope's optical system transmits up to 98% of available light, ensuring maximum brightness in low-light, low-contrast hunting situations. To simplify field adjustments, Nikon also integrated a zero-reset turret into the riflescope. Just sight in as usual, lift the spring-loaded adjustment knob, rotate to your "zero," and re-engage. Field adjustments are now as simple as dialing in your subsequent ranges.