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 designed to enable clear viewing of 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 replaceable Corning Glass sacrificial lens that installs without tools, providing protection for the NVG lens. Enables visual clarity at all distances without requiring manual focus adjustment on the NVG. Offers infinitely variable iris control from fully open to fully closed, optimizing light input while maintaining auto-focus functionality. Equipped with a clear front sacrificial lens to protect against dust, debris, and scratches. Allows rapid adaptation to changing light levels via the adjustable iris ring. Designed for secure and easy attachment to the front of compatible NVG models. 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