A dimple pattern for a golf ball with multiple sets of dimples is disclosed herein. The first and second aperture blades are rotated, in a plane perpendicular to the optical axis of the optical path, about a movable shaft, which is parallel to the optical axis. One of the pinned layers is pinned by exchange coupling with an AFM layer, while the other pinned layer is self pinned by a shape enhanced magnetic anisotropy without the use of an AFM layer.