Products Description
Precision Engineered for Serious Outdoor Professionals
The DTS-31L is a professional Gen 2+ head-mounted night vision binocular designed for outdoor enthusiasts, security professionals, and field operators who demand clarity, durability, and all-night reliability. Built around a custom-tuned image intensifier tube and a uniquely extended optical body, the DTS-31L sets a new benchmark in its class - delivering sharper images, greater eye relief, and superior low-light performance compared to standard-length competitors.
At the heart of the DTS-31L is a proprietary, custom-manufactured Gen 2+ image intensifier tube, individually selected and calibrated to meet higher resolution and signal-to-noise thresholds than off-the-shelf equivalents. This means every unit you receive has been purpose-built - not pulled from a generic production line.
If you've ever compared two "identical" night vision devices and noticed one simply looked better - tube quality is why. With the DTS-31L, that variable is controlled by design.
Resolution
Resolution: 55–63 lp/mm - resolves fine detail at distance that standard Gen 2 tubes cannot
photocathode sensitivity
Higher photocathode sensitivity for improved performance in starlight or overcast conditions
No distortion
Tighter quality control at tube level = more consistent image brightness and less distortion across the field
Extended Optical Body - Built Longer for a Reason
The DTS-31L features an elongated optical tube design that is intentionally longer than most comparable head-mounted binoculars on the market. This isn't aesthetic - it's functional:
| Advantage | Why It Matters |
| Greater internal optical path length | Allows finer correction of aberration and distortion at the eyepiece |
| Improved baffling against stray light | Reduces internal flare, especially with the IR illuminator active |
| Better thermal stability | Longer housing dissipates heat more evenly, protecting tube performance over extended use |
| Enhanced eye relief geometry | The 30mm eye relief and 8mm eyepiece aperture work in concert with the longer body for a more natural, fatigue-free viewing position |
For outdoor professionals spending hours on observation - whether tracking wildlife, conducting search operations, or navigating remote terrain at night - this design translates directly into less eye strain and more consistent image quality over a full night's use.
The DTS-31L's custom tube delivers a resolution of 55–63 lp/mm at 1× magnification, preserving your natural sense of depth and distance - critical for moving safely in dark environments. Optical distortion is held to ≤0.5%, and diopter adjustment (±5) combined with interpupillary distance adjustment (50–80 mm) ensures a sharp, personalized image for virtually any user.
Wide 50° Field of View - See More, Miss Less
The standard 50° (±2°) field of view - with an optional 40° configuration - gives you broad spatial coverage ideal for:
- Scanning wide terrain during nighttime hiking or basecamp security
- Tracking fast-moving subjects during wildlife observation
- Maintaining situational awareness during search and rescue operations
- Navigating dense forest or low-visibility environments
Automatic Brightness Control (ABC) continuously adjusts image output as ambient light shifts, while the Bright Light Cut-off protects the tube when unexpected light sources appear - a headlamp, vehicle lights, or a sudden flare.
Built-in 850nm IR Illuminator - Extend Your Range in Total Darkness
When passive starlight or moonlight isn't enough, the integrated 850nm / 20mW infrared illuminator activates to flood your field of view with invisible light, restoring image clarity without alerting others to your position. The IR indicator confirms illuminator status at a glance, so you always know what mode you're operating in.
The DTS-31L supports Flip-Up On/Off and Side Flip-Up On/Off - flip the binocular up to return to natural unaided vision instantly, without removing your head mount. This is especially valuable during:
- Trail navigation where you alternate between NVG and map/phone use
- Wildlife observation requiring quick switches between aided and unaided view
- Any scenario where situational flexibility matters more than static observation
Up to 300 Hours Battery Life
Powered by a widely available CR123A battery, the DTS-31L runs for up to 60 hours on a single cell. Pair it with the optional extended battery pack and runtime stretches to 300 hours - enough for multi-day expeditions without resupply.
- No proprietary battery formats
- CR123A available globally, including remote resupply points
- Low battery indicator gives advance warning before shutdown
Built for the Outdoors - IP67, −40°C to +55°C
The DTS-31L is rated IP65 and IP67, meaning it handles submersion and sustained water exposure - not just rain splash. Combined with an operating range of −40°C to +55°C and humidity tolerance of 5%–95%, it's ready for:
- Alpine environments and snowpack conditions
- Tropical humidity and monsoon rain
- Desert temperature swings from freezing nights to scorching days
At 452g (housing) / 523g (complete), the DTS-31L keeps head load minimal for extended wear. The 120 × 178 × 85mm body is compact enough for pack storage between observation windows.
Technical Specifications
| Parameter | Specification |
|---|---|
| Generation | Gen 2+ |
| Magnification | 1× |
| Resolution | 55–63 lp/mm |
| Field of View | 50° ±2° (40° optional) |
| Diopter Adjustment | ±5 |
| Optical Distortion | ≤0.5% |
| IR Illuminator | 850nm, 20mW (built-in) |
| Power Supply | CR123A |
| Battery Life | 60h standard / 300h with optional pack |
| Waterproofing | IP65 / IP67 |
| Operating Temperature | −40°C to +55°C |
| Relative Humidity | 5%–95% |
| Dimensions | 120 × 178 × 85mm |
| Weight | 452g (housing) / 523g (complete) |
| Eye Relief | 30mm |
| Eyepiece Aperture | 8mm |
| IPD Adjustment | 50–80mm |
Who Is the DTS-31L For?
The DTS-31L is purpose-designed for:
🌲 Wilderness & backcountry hikers navigating pre-dawn or post-dusk trails
🦌 Wildlife observers & nature photographers working in low-light conditions
🔍 Search and rescue volunteers operating in unlit terrain
🏕️ Overlanders & expedition campers requiring extended battery and all-weather reliability
🛡️ Security & site protection professionals covering large outdoor areas at night
🔭 Astronomy & stargazing enthusiasts wanting enhanced dark-sky observation
Everything You Need to Know
Q1: What makes the DTS-31L different from other Gen 2+ night vision binoculars?
Two things set it apart. First, the DTS-31L uses a custom-selected and calibrated image intensifier tube rather than a standard production tube - meaning tighter resolution consistency and better low-light sensitivity per unit. Second, its extended optical body design is longer than most competitors in this class, which improves aberration correction, reduces internal flare, and contributes to a more comfortable viewing geometry during long observation sessions.
Q2: Is Gen 2+ good enough for serious outdoor use, or do I need Gen 3?
For the vast majority of outdoor applications - hiking, wildlife observation, search and rescue, camping security - Gen 2+ is more than sufficient. Gen 3 tubes offer incremental gains in photocathode sensitivity and tube longevity, but at a significantly higher price point. The DTS-31L's custom tube selection process means you're getting Gen 2+ performance at the upper end of what the generation is capable of delivering.
Q3: Can I use the DTS-31L while wearing glasses?
Yes. The ±5 diopter adjustment range covers the majority of common prescriptions, allowing most glasses wearers to achieve a sharp image without their eyewear. The 30mm eye relief and 8mm eyepiece aperture also accommodate a comfortable viewing distance. For stronger prescriptions, we recommend testing with your specific correction before field deployment.
Q4: How does the IR illuminator affect battery life?
Running the 850nm IR illuminator does draw additional power compared to passive-only operation. In typical mixed use - passive observation with occasional IR activation - the standard 60-hour figure represents conservative real-world usage. The optional battery pack's 300-hour rating is based on passive use; IR-heavy use will reduce this proportionally, though the CR123A format means field battery swaps are straightforward.
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