Description
The DNT HS335 Hydra is one of those optics that earns its keep because it does three jobs instead of one. Mount it as a standalone thermal riflescope, clip it in front of your daytime LPVO or prism optic, or pop the mount off and use it as a handheld monocular for scanning. That flexibility is the whole point of the Hydra line, and the HS335 sits in the sweet spot between the budget 256 models and the pricier 640 units.
At the heart of it is a 384×288 uncooled infrared sensor with a 12μm pixel pitch and ≤18mK NETD sensitivity, which translates to a cleaner, more detailed thermal picture with less graininess. The 35mm objective lens gives you a 3x base magnification and digital zoom that steps up through 4.5x, 6x, 9x, and 12x. That larger lens is the difference maker for open-country work, feeding more thermal energy to the sensor so you can identify game out past 250 yards instead of just spotting a blob of heat. DNT's Image Super Resolution (ISR) processing pushes the 384 image toward near-640 clarity at higher zoom, which is a big reason this scope punches above its weight.
What Sets the HS335 Hydra Apart
The image rides on a sharp 1024×768 micro-OLED display running at 50Hz, so motion stays smooth. You also get onboard photo and video recording with audio, 32GB of built-in storage, WiFi connectivity through the DNT app, Picture-in-Picture mode, and a selection of color palettes and reticles. The generous 65mm (2.5 inch) eye relief is a nice touch, especially if you're running it on a hard-kicking rifle.
Built to Take a Beating
The HS335 Hydra is CNC machined from a single block of 6061 aircraft-grade aluminum and carries an IP67 waterproof rating, so rain, snow, and dust aren't a concern. It's rated to handle recoil up to .50 BMG and weighs just 13.7 oz, making it the most compact unit in the Hydra family. Power comes from a single flat-top 18650 rechargeable battery good for about 4.5 hours, and since they're swappable, carrying a spare keeps you running all night. A USB-C port lets you run off external power too.
Key Specifications
- Manufacturer: DNT Optics
- MPN / Model: HS335
- UPC: 850065096186
- Thermal Sensor Resolution: 384×288 pixels
- Pixel Pitch: 12μm
- NETD Sensitivity: ≤18mK @25°C
- Objective Lens: 35mm
- Base Magnification: 3x
- Digital Zoom: 3x, 4.5x, 6x, 9x, 12x
- Display: 1024×768 Micro-OLED, 50Hz
- Refresh Rate: 50 FPS
- Eye Relief: 65mm (2.5 in)
- Battery: Single 18650 flat-top, ~4.5 hr runtime
- Memory: 32GB built-in
- Ingress / Recoil Rating: IP67 / .50 BMG (800Gs)
- Weight: 13.7 oz
What’s Included
- DNT HS335 Hydra thermal scope
- QD Picatinny mount
- Eyecup
- Flip-up lens cover
- 18650 flat-top battery
- Charger
- USB cable
- User manual
Frequently Asked Questions
Can the DNT HS335 Hydra really be used as a clip-on?
Yes, the HS335 is a true 3-in-1. It works as a standalone thermal scope, mounts in front of a daytime LPVO or low-magnification prism optic as a clip-on, and runs as a handheld monocular for scanning. For the best clip-on results, DNT recommends staying in the lower half of your LPVO's magnification range.
What's the difference between the HS335 and the HS325?
Both share the same 384×288 sensor and ≤18mK sensitivity, so the thermal detection quality is similar. The difference is the lens: the HS335 has a 35mm objective with 3x base magnification for more reach, while the HS325 uses a 25mm lens with 2x base mag and a wider field of view. The HS335 is the better pick for open-country hunting where you need to identify targets past 250 yards.
What battery does the HS335 Hydra use and how long does it run?
It runs on a single flat-top 18650 rechargeable battery, which is non-proprietary, so replacements are easy to find. You'll get roughly 4.5 hours of continuous use per battery, and since they swap out quickly, most folks carry a spare or two for all-night sessions. There's also a USB-C port for running off external power.
Can the HS335 Hydra record video and connect to a phone?
Yes. The HS335 has onboard photo and video recording with audio and 32GB of built-in storage. It also connects over WiFi to the DNT app, so you can stream the image to your phone, adjust settings, and pull footage off the device.





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