Start from the supplied illustrated iris first frame. Locked straight-on camera. Keep the circular outer housing stationary and keep the opening centered. The same six rigid overlapping blades move together by a small amount so their visible inner edges make the central opening smaller. Preserve the blade seams and their overlapping order. Do not stretch the housing, gather the blades like cloth, fade in an opaque disk or add another blade. Stop with a clearly visible smaller opening; do not close it completely. Hold the final arrangement. One continuous view, no camera movement or lighting fade.