Description

Infinity Cap PVS-31A – Rugged NVG Iris with Click-Stop™ Infinite Focus

The Infinity Cap PVS-31A is a mission-ready accessory designed to deliver maximum protection and unmatched adjustability for your night vision device. Built from 6061-T6 aluminum and anodized to MIL-A-8625F Type II Class 1 & 2 standards, this cap is engineered to withstand battlefield abuse while preserving optical performance.

Unlike friction-fit covers, the Infinity Cap threads securely onto the NVG objective lens, preventing accidental detachment. A built-in O-ring seal keeps dust and debris out, while the integrated polycarbonate sacrificial lens ensures your expensive PVS-31A optics remain protected against scratches and impact — without sacrificing light transmission (92% clarity).

The defining feature is its adjustable iris system, which ranges from 23.5mm down to 1mm, allowing precise control over light intake and depth of field. The patent-pending Click-Stop™ technology provides tactile feedback at 5.66mm, instantly setting your optic to infinite focus. This enables rapid transitions between environments — from wide-open low-light operation to restricted aperture control in brighter conditions.

Features

• Rugged 6061-T6 aluminum housing
• MIL-A-8625F Type II anodized finish (Class 1 & 2 standard)
• Threaded mount for secure, no-slip attachment
• Polycarbonate sacrificial lens with 92% light transmission
• O-ring sealed against dust and debris ingress
• Adjustable iris from 1mm to 23.5mm
• Click-Stop™ tactile feedback at 5.66mm for instant infinity focus
• Sacrificial lens holder accepts aftermarket PVS-14 style accessories (≤32.4mm OD)
• Specifically designed to fit PVS-31A objective lenses