How does the thermal auto-zero feature work between the thermal sensor and the 4K digital channel?

The ThermNight 4K features a thermal auto-zero system where zeroing the 4K digital optic automatically synchronises the zero coordinates for the thermal sensor. This eliminates the need to perform a separate complex zeroing process for both channels on your rifle. Once your day channel is locked in, your thermal point of impact is aligned simultaneously.

What is the practical positive identification range for the 256 x 192 thermal core?

While the high-sensitivity thermal core detects medium game out past 800 to 1,000 metres, positive target identification becomes pixelated beyond 250 to 300 metres. If your primary hunting style requires long-distance thermal PID past 300 metres in thick timber or heavy fog, you may want to consider a dedicated high-end thermal scope with a 640 x 512 resolution core instead.

What battery life can I expect from the ThermNight 4K during extended outback hunting trips?

The scope runs on removable, rechargeable 21700 flat-top Li-ion batteries—with two typically bundled in the kit—delivering up to 11.5 hours of continuous runtime. It also features a USB-C port for direct power input or charging in the field using standard Australian USB power banks. It operates reliably in ambient temperatures ranging from -20°C to +50°C.

Is the scope heavy on a rifle, and what is its recoil rating for heavy calibres?

The unit weighs 737 grams (26.0 ounces) excluding mounts and the detachable IR illuminator, which adds noticeable weight compared to a standard day scope. However, it is built tough with an IP67 waterproof rating and is recoil-rated up to 800 Gs, making it fully safe for heavy-hitting hunting calibres up to .50 BMG.

Thermal Scope - DNT TNC4K219R

The DNT Optics ThermNight 4K Multispectral Scope (Model: TNC4K219R) combines thermal target detection with 4K digital day and night optics on a single rifle platform. Measuring 196 × 82 × 78 mm and weighing 737 g, this optic houses a thermal core to detect heat signatures through brush and darkness, alongside a digital day/night sensor for clear target identification. An integrated laser rangefinder measures reflective targets from 5 to 2,100 yards, feeding direct target distances into an onboard ballistic engine to compute precise holdover solutions. Zeroing the 4K digital optic automatically synchronises the zero coordinates for the thermal sensor via Thermal Auto-Zero.

Key Features

Multispectral Sensor System: Integrates a 256 × 192, 12 µm thermal sensor (NETD ≤18 mK) with a 3840 × 2160 (4K UHD) CMOS digital day/night sensor, viewable concurrently via Picture-in-Picture (PiP).
Integrated Laser Rangefinder and Ballistics: Ranges targets from 5 to 2,100 yards (5 to 1,920 m) and calculates shooting solutions through the DNT ballistic engine.
Display and Optical Range: 0.49-inch Micro-OLED display (1920 × 1080 resolution) with 65 mm eye relief, delivering 2x to 8x thermal magnification and 3x to 24x digital magnification.
Detachable IR Illuminator: Provides supplemental night vision illumination with a rated beam distance up to 450 yards (~410 m).
Recoil-Rated Construction: Built to withstand up to 800 Gs of recoil (rated up to .50 BMG) and rated IP67 for water immersion up to 1 m for 30 minutes.
Power Supply: Powered by a removable flat-top 21700 Li-ion battery providing up to 5.45 hours of continuous runtime, chargeable directly via USB-C.
Mounting: Mounts directly to Picatinny and weaver rails using an included Quick Detach (QDS150) or 20 MOA cantilever mount.

Product Specifications

Thermal Resolution: 256 × 192
Thermal Pixel Pitch: 12 µm
Thermal Lens: 19 mm (Field of View: 9.2° × 6.9°)
Thermal Sensitivity: NETD ≤18 mK
Digital Sensor Resolution: 3840 × 2160 (4K UHD) @ 30 fps
Digital Lens: 50 mm f/1.8
LRF Range: 5 to 2,100 yards (4.5 to ~1,920 m)
Dimensions: 196 × 82 × 78 mm
Weight: 737 g
Operating Temperature: -20°C to +50°C
Internal Storage: 64 GB onboard memory

Who is the DNT ThermNight 4K Multispectral Scope for?

Feral pest controllers targeting wild dogs and pigs — detects game via the 256 × 192 resolution thermal sensor and pairs immediate target confirmation with an integrated 2,100 yards laser rangefinder on this multispectral rifle scope.
Predator hunters operating in mixed-light conditions — provides daytime clarity and night target acquisition via the 3840 × 2160 resolution 4K sensor, balancing thermal scanning with digital identification inside a 737 g multispectral rifle scope.

Less suitable for: Long-distance thermal positive identification past 300 m; a dedicated 640 × 512 thermal scope is required.