DNT Optics Hydra HS325 — 384×288 thermal riflescope

How far you can see a person

80 m make out detail130 m tell what it is521 m spot it

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Calculated from the sensor's pixel pitch and the lens focal length, for clear air.

DNT OpticsRiflescope · 384-class

DNT Optics Hydra HS325

Approx. price: ~$1,550
Sensor: 384×288 · 12 µm
Lens: 25 mm · 2×
Weight: 13.4 oz

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Best for

A dedicated night rifle for hogs and coyotes inside about 150 yards

01Specifications

As published by DNT Optics. Sources: dntoptics.com.

Sensor: 384×288
Pixel pitch: 12 µm
NETD: ≤18 mK
Refresh rate: 50 Hz
Lens: 25 mm
Base magnification: 2×
Digital zoom: up to 8×
Display: 1024x768 OLED
Run time: 4.5 h
Battery type: 18650
Weight: 13.4 oz
Length: 8″
Laser rangefinder: No
Ballistic calculator: No
Wi-Fi: Yes
IP rating: IP67
Warranty: 2 years
Approx. price: ~$1,550

02Pros and cons

From the published specs. What owners report is in the next section.

For it

Sensitive sensor that picks out small heat differences on humid or rainy nights (56th-best of 285 that publish it)
Takes 18650 batteries you can swap in the field
Light at 13.4 oz, 4th-lightest of the 194 riflescopes here
Waterproof (IP67), survives a dunking
~$1,550, well under the ~$3,000 typical for riflescopes here

Against it

Only 4.5 h of battery
Short 25 mm lens: a wide view, but less reach than a 50 mm scope
No rangefinder, so you judge distance by eye
Entry-level 384×288 sensor, with less detail than a 640
Zoom past 2× is digital and gets blurry

03What owners say

owner discussions, 2025–2026

Summarised from 11 public owner discussions between 2025 and 2026. Owner experience, not a measurement.

The HS325 is the entry ticket to DNT's do-everything Hydra line, and owners treat it that way: a first thermal that can be handheld, rifle-mounted or clipped on for around $1,400 to $1,550 out the door with a QD mount. Owners who have one are mostly pleased; the recurring lines are 'better than I thought it would be', 'for the price you can't beat it', and a nice starter thermal. Two owners say they can identify coyotes well past 200 yards, one claiming 350 to 400, while another puts its comfortable limit nearer 250.

The regret, when it comes, is resolution. Several buyers say they wish they had spent roughly $1,000 more on the 640-sensor HS635, one felt it before he had opened the box, and an owner who later bought an iRay RH25 V2 calls the iRay far clearer. Clip-on use is the other caveat: owners point out it is not a true 1x clip-on, so reticle holds through a magnified scope do not work cleanly.

What owners like

Owners describe the picture and features as hard to fault at the price, and one posted a 200-yard hit to show it is enough for typical coyote and hog distances.
Battery life gets specific praise, and the kit has come with spare 18650 cells and a charger.
It uses an EOTech-style footprint, so owners run it on common QD mounts; one builds a full night rifle around it on a 1.70-inch ADM riser in front of a red dot.
Flexible enough to be the scanner once an owner moves up: one who bought an RH25 kept his Hydra for handheld scanning.
One owner whose unit was defective says the return was easy, and another rates DNT's customer service highly.

Common complaints

Resolution is the regret: several owners and would-be buyers say the HS635 is worth the extra money, and one who added an RH25 V2 calls it far clearer.
Not a true 1x clip-on, so holds through your day scope's reticle do not line up, and the base magnification makes clip-on use behind an LPVO awkward.
The housing feels cheap in the hand; an owner sums it up as 'they feel cheap, upside they are cheap'.
Early units lack the rangefinder and ballistics, and at least one owner says he greatly wishes he had bought the LRF version.
One dissenter who knows people at the company describes poor service and quality problems with Hydras in late 2025; it is a minority view against several satisfied owners, but it is not the only service complaint about the brand.

HS325 or HS635?

Owners who have used DNT's 640 units, or who bought the 325 and wondered, mostly say get the 635 if you can stretch about $1,000 further, especially for clip-on use where the extra pixels matter more. Owners happy with the 325 shoot mostly inside 200 yards and use it as a dedicated rifle sight.

Will it work as a clip-on in front of an LPVO?

It mounts, but owners say it is not a true 1x clip-on, so your reticle holds will not be right, and the higher base magnification compounds that behind a 1-6 or 1-8. One owner never bothered because it did not line up with his scope mount height. If clip-on is the main use, owners steer toward the 640 Hydra.

Hydra HS325 or ThermNight TNC335R?

One buyer who called the dealer ended up with the ThermNight because it has an onboard rangefinder and ballistic calculator, and said he would only pick the Hydra if he really wanted clip-on use.