InfiRay Jerry-31: A Feature-Rich Entry-Level Night Vision Binocular

As night vision technology continues to evolve, rising image intensifier tube prices have made affordable binocular night vision systems increasingly attractive to newcomers and recreational users. The InfiRay Jerry-31 enters this market as a compact, lightweight, and feature-rich binocular designed to deliver solid performance at a more accessible price point. For beginners entering the night vision market, recreational users, airsoft enthusiasts, hunters, and those seeking a versatile binocular without premium-level pricing, the Jerry-31 presents a compelling option that delivers a well-rounded feature set and practical real-world performance. Key strengths include:

• Lightweight and compact design
• Manual gain adjustment
• Articulating pods
• Programmable tube shut-off functions
• Integrated IR illuminator
• Long battery life
• Good distortion control
• Compatibility with the Jerry thermal ecosystem

One of the most noticeable aspects of the Jerry-31 is its compact form factor. The binocular uses a polymer housing and compact optical pods that significantly reduce overall size and front-end weight. The actual operating weight falls roughly between 470 and 480 grams, depending on configuration, making it one of the lighter binocular systems available in its category. The reduced mass helps minimize neck strain and improve comfort during extended use. The housing features:

• Articulating optical pods
• Adjustable interpupillary distance (IPD)
• Manual gain control
• Built-in infrared illuminator
• External battery pack capability
• Waterproof construction (IP67 rated)

User-Friendly Controls: One of the strongest aspects of the Jerry-31 is its intuitive control system. Unlike many night vision devices that require multiple buttons and complex menus, the Jerry-31 utilizes a simple rotary power and gain adjustment knob. Users turn the dial to power the system on and continue rotating to increase image intensifier gain, much like adjusting volume on a radio. This straightforward interface makes the device particularly approachable for first-time users and reduces the learning curve often associated with night vision equipment.

Manual Gain Control: The Jerry-31 supports manual gain adjustment, allowing users to fine-tune image brightness according to ambient lighting conditions. This feature is often appreciated by experienced users who want greater control over image presentation and contrast.

Optical Features: The front of the binocular includes integrated daylight training covers equipped with pinhole apertures. These allow users to focus the system during daylight hours while protecting the image intensifier tubes from excessive light exposure. An integrated infrared illuminator is also built into the housing for situations where ambient light levels are extremely low.

Power System: The device is powered by a single AA battery and delivers approximately 20 hours of runtime under normal operation. For extended missions or prolonged use, users can connect an optional external battery pack, increasing runtime to roughly 80 hours.

Programmable Features: The Jerry-31 includes several programmable functions that can be enabled or disabled through simple button sequences.

Individual Pod Shut-Off: By activating the articulation-based shut-off feature, each optical pod automatically powers down when rotated away from the user's eyes. This helps reduce tube wear and limits unwanted light emission when one side of the binocular is not in use. This feature generally works well, although extreme upward viewing angles may occasionally trigger an unintended shut-off.

Bright Light Protection: The binocular also incorporates a bright-light shut-off function. If the system detects strong illumination for an extended period, it can automatically power down to protect the image intensifier tubes. However, this function has uncertainty regarding the exact activation threshold.

Image Intensifier Tubes: The Jerry-31 utilizes NVT image intensifier tubes with a FOM range of approximately 1400 to 1600. Instead of autogating, the tubes employ Bright Source Protection (BSP), a system that automatically reduces operating voltage when exposed to strong light sources. While this approach may reduce image sharpness more noticeably than autogating under certain conditions, it still provides effective protection against light damage. The concerns about non-autogated tubes being extremely fragile are often exaggerated. In fact, NVT tubes have demonstrated considerable durability when used responsibly.

Distortion Control: Compared to other budget-oriented optics, the Jerry-31 delivered notably cleaner geometry and more natural image presentation. Although premium Carson lenses still produced the best overall results, the reviewer considered Jerry-31's distortion control excellent relative to its cost. Distortion testing revealed:

• Minimal barrel distortion
• Very limited pincushion distortion
• Generally flat image rendering

Urban Environment Performance: In mixed-light urban environments, the Jerry-31 maintained good usability while revealing some limitations associated with its tube specifications: reduced image clarity compared to higher-end systems, more noticeable chromatic aberration near bright light sources, and resolution reduction caused by BSP operation under intense lighting. Despite these limitations, the system continued to provide effective situational awareness and target detection. Although the standard Jerry-31 configuration features non-autogated image intensifier tubes, Vantax can provide autogated tube options upon request to accommodate diverse requirements. This flexibility allows users to select the most suitable configuration for their mission needs, operating environments, and budget, ensuring dependable performance across a broader range of lighting conditions.

Flare Resistance: Flare resistance testing showed solid performance. The Jerry-31 produced fewer distracting flare artifacts than some competing budget optics, although it did not reach the performance level of premium Carson lenses, which remain a benchmark in the industry. The absence of autogating pulse artifacts may actually create a cleaner viewing experience in some urban environments compared to certain autogated NVT tube systems.

Rural and Woodland Performance: In darker rural settings, many of the optical compromises observed in urban environments became less apparent. With fewer artificial light sources present, chromatic aberration was significantly reduced, image brightness remained strong, and detail rendering was adequate for navigation and observation. In a word, Jerry-31 is well-suited for recreational outdoor activities, including hiking, range use, and general nighttime exploration.

The Jerry-31 positions itself as a highly capable entry-level binocular night vision system that balances affordability, functionality, and usability. While it does not compete directly with premium military-grade systems equipped with top-tier tubes and optics, it offers an impressive collection of features rarely found together at this price point.