NOTE: Quantity is per tube. You must select quantity of 2 for DUAL TUBE Systems. The package includes only the Focusing Aperture, not the night vision device. Please verify the quantity when placing the order. FEATURE: The Focusing Aperture is an advanced Night Vision Goggle (NVG) accessory, enabling the operator to view objects at various distances. It features a smooth-action, high-performance optical iris that can be quickly adjusted open or closed based on ambient light conditions. The Focusing Aperture includes a high-quality Corning Glass sacrificial lens that can be replaced quickly without tools. Provides the ability to see objects at all distances without adjusting the focus on Night Vision Goggles. Infinitely variable from open to closed to allow optimal light intake into the NVGs while maintaining auto-focus capability. Clear front sacrificial lens protects the NVG lens and prevents dust and debris from entering the device. Rapid adaptation to ambient light by turning the adjustment ring to open or close the iris. Easy and secure attachment to the end of NVGs. Compatible models: TYPE 1 VARIANT (NAVAIR) 37mm OD AN/PVS-6 AN/PVS-7 AN/PVS-7B/D ANVIS-9 AN/PVS-14 NEPVS-14 AN/PVS-23 (F5050YG) DTNVG DTNVS RNVG TNVC-BNVG-M (Artemis) MOD3 TYPE 2 VARIANT (GROUND) 34mm OD AN/PVS-15 AN/PVS-18 AN/PVS-31A BNVD MUM-14 GPNVG