1mm-23.5mm Adjustable PVS31 Lens Cover Iris Aperture with Lens Protector，NVG O-Ring Night Vision Goggles Cap，Compatible with 31mm/32mm PVS-31 and 38mm GPNVG Systems Objective Lens Outer Diameter

Features: Sturdy 6061 t6 aluminum housing Anodizing conforms to mil-a-8625f type ii class 1 and class 2 standard Securely mounts to the objective lens to avoid accidental removal Polycarbonate sacrificial lens for 92% light transmission O-ring for keeping debris out Adjustable iris that goes from 1mm to 23.5mm Sacrificial lens holder can accept accessories for PVS-14 style lens such as lif or sacrificial lenses with an outside diameter not 32.4mm Will fit on Many PVS-31 objective lenses

• The PVS31 lens cover is design to protection and change the performance of night vision devices like the PVS-31 and gpNVG systems with 31mm–38mm objective lens diameters.
• Suitable for installation on GPNVG units with a 38mm objective lens outer diameter，or on Many PVS-31 night vision device with a 31mm or 32mm objective lens outer diameter.
• PVS31 lens cover – rugged protection & suitability focus for night vision devices，engineered from rugged 6061-t6 aluminum，this suitability-built cover make long-term sturdiness in regular field conditions.
• Unlike traditional friction-fit caps，it secures directly to the objective lens threads for a firm，no-slip fit. an internal o-ring seals out fog and moisture，while a sacrificial polycarbonate lens protects your optics from scratches and impact — making it suitable for and outdoor scenes.
• Adjustable aperture system users to fine-tune light transmission and focus with ease. simply rotate the turret to adjust from 23.5mm down to 1mm，with a tactile stop at 5.66mm for return to infinity focus. you're operating under shifting lighting or sudden exposure，this system offers control and adaptability.