The Aperture Sight is a precision sight with an open view around it. There is a Single black crosshair with a fairly large central black dot center, great for quick aiming on targets and keeping scoped in on areas while still being able to monitor your surroundings. Minimal zoom, hardly if any difference to zoom of Iron Sights. The Aperture Sight is similar to the red dot sight in Call of Duty 4. This is only unlocked by completing Marksman II Challenges (75 Kills with weapon) with Rifles and SMGs.