DNT ThermNight
Multi-Spectral Scopes

Buying Guide – Which DNT ThermNight Is Right for You?

1. Start with your typical shooting distance

• Sub-100 m, paddocks, barns, air rifle / rimfire

  TNC225R is ideal. The 256×192 thermal core and 25 mm lens give plenty of detection for small vermin at sensible ranges while keeping cost and weight down.

• 100–200 m mixed terrain, foxes and rabbits

  TNC335R steps up to a 384×288 sensor and 35 mm lens, giving a noticeable jump in usable detail and identification at range, especially on smaller targets.

• Consistent 200 m+ shots, open farmland and larger permissions

  TNC635R is the top-end option, with a 640×512 sensor that delivers a wider field of view and finer detail for confident ID before you squeeze the trigger.

2. Decide how important image detail is

All three scopes are multi-spectral, but thermal resolution is the big differentiator:

• Good: TNC225R – perfectly capable for spotting and shooting typical UK vermin but with fewer pixels on target.

• Better: TNC335R – smoother image, more detail in fur, ears and background, easier to pick animals off hedgelines.

• Best: TNC635R – premium clarity; details like legs, tails and posture are easier to interpret at longer distances.

If you want a “buy once, cry once” scope and you shoot a lot at night, the 640×512 sensor of the 635R is the one to aim for.

3. Think about platform & balance

• Air rifles / light rimfires:

  TNC225R is the easiest to justify – lighter price point, plenty of performance, and well-matched to typical airgun ranges.

• Centrefire foxing rifle:

  TNC335R or TNC635R are better mates for the additional range and recoil, while still remaining compact and IP67-rated.

4. Multi-spectral advantages vs pure thermal

Because ThermNight scopes combine optical day / night vision and thermal, you get:

• Colour daytime use – no need to swap optics when the sun goes down.

• IR-assisted night vision – Sony Starvis-type sensors give clean NV imagery that works well for ID around farm buildings.

• Thermal overlay / PIP – use thermal PIP for fast detection while keeping the main screen on detailed optical/NV for positive ID.

If you currently run a separate daytime scope and clip-on or handheld thermal, a ThermNight can simplify the whole setup into a single optic.

5. Laser rangefinder & ballistic calculator

All models include integrated LRF and ballistic calculator, which takes a lot of guesswork out of holdover at night. Set your profile once, confirm your zero, and the scope will provide distance-aware aiming information so you can focus on wind, backstop and shot execution.