RH25 / Pfalcon640 Enhanced Focusing Thermal Defender (v3)

The Cold Harbour Enhanced Focusing Defender provides rugged, multi-impact protection and enhanced usability for the Infiray PFalcon640+, Iray RH25, PFalcon384+, and RL25 family of thermal devices. Building on the proven legacy of our Defender line, this third-generation design combines the durability of our multi-hit rated proprietary TPU armour with a built-in throw lever, delivering both protection and refined user control.

Made from the same temperature-stable, proprietary flexible TPU material as all of our thermal Defender line, the RH25v2/PFalcon640 Enhanced Focusing Defender is designed for reliable use in force-on-force and harsh environments without risk of damage to the host device. Unlike brittle Nylon-12-based protectors, this TPU construction remains resilient and impact-resistant across temperature extremes, while maintaining a low-signature, non-reflective finish.

This included a rubber day cap of the RH25v2/PFalcon640 can be used with this protector for comprehensive storage protection. 

Enhanced Focusing System

The built-in throw lever replaces the throw lever on your existing RH25v2/PFalcon640 for ease of focus, even with gloved hands or in austere conditions. The precision slip fit protector improves on our legacy design 

Second-Generation Sacrificial Lens Retention

A custom TPU O-ring system replaces older tab-based lens retention designs, allowing for quick, secure, and user-serviceable swaps of sacrificial lens elements in the field. This ensures continued protection and optical clarity without the need for tools or permanent fixtures.

Design and Compatibility

The Defender installs directly over the factory objective lens shroud and is secured via friction and an internal flange that grips onto the inside of the objective lens. Carefully designed notches allow for a full focus range of the RH25/Pfalcon systems. 

Available Protection Levels

Recognizing that mission needs vary, the Enhanced Focusing Defender is available in three distinct protection configurations:

Level 1 – Germanium Sacrificial Lens
Optical-grade, multi-coated Germanium lens optimized for the 8–14µm wavelength range. Absorbs up to a 0.2g BB at 350fps and withstands UTM and Simunition impacts at point-blank range with no penetration. Provides maximum optical performance with no perceivable signal degradation. Not multi-impact rated.

Level 2 – Titanium Honeycomb Shield
A custom-fabricated titanium honeycomb provides true multi-hit capability, tested up to 400fps with 0.2g BBs at point-blank range. The cell structure halts projectiles while maintaining thermal transparency (~10% reduction in thermal signal, with corresponding noise reduction). Some spalling may occur depending on ammunition type.

Level 3 – Germanium + Titanium Hybrid
Combining both the Germanium sacrificial lens and titanium honeycomb, this configuration offers the highest level of protection, balancing impact resistance and spall control. While this combination is multi-impact rated, due to the fragile nature of germanium and spalling, the durability of the germanium is not guaranteed.

Install Guide:


Compatibilty: PFalcon640+ v1 & v2, Iray RH25 v1 & v2, PFalcon384+, and RL25 family of devices. 

DISCLAIMER: Replacement germanium sacrificial lenses can be purchased HERE. Proudly designed, made, and assembled in Canada. 

Due to the brittle nature of germanium, neither Cold Harbour Supply nor ISLE MFG are liable for damage to the host device as a result of the failure of the user to replace the sacrificial lens as necessary after impacts when the structural integrity may be compromised.