Best Thermal Clip-On Scopes for Hunters
Quick answer
For night hunting, the best Pulsar thermal clip-on scopes are:
- Krypton 2 FXG50 — designed for long-range precision, open fields, and clear, dry conditions where distance and identification accuracy are critical.
- Krypton 2 FXQ35 — built for compact balance, mixed terrain, and humid environments.
Both models mount directly in front of your day scope, converting it into a thermal imaging system with no need to re-zero.
Choose the FXG50 — when you need longer-range precision and detailed image quality for confident animal identification across mid to long distances in open terrain.
Choose the FXQ35 — when you value compact balance, extended battery life, and dependable performance in forests, stalk hunting, or foggy, foliage-heavy conditions.
Read on to find out which Pulsar clip-on best suits your rifle, terrain, and hunting style.
Unsure if a clip-on is the best tool for you? Here’s what our expert hunter, Riccardo Tamburini, says about using one:
Clip-on is the best choice when the scope is mounted on the rifle with a fixed mount; this will be the only way to not lose the zeroing of your daytime scope. This is the real fact that should drive the hunter’s purchase.
Yes, there is also the possibility of having two devices in one – a thermal scanner and a thermal aiming system – but they can’t be used at the same time because, during the night, it is better not to complicate your life. Moving fast and in a rush could compromise your action, because the movements or sounds produced can be detected by animals, and also because it is possible you will not mount the clip-on properly on the objective lens of the scope, losing the precision.
Krypton 2 FXG50 — Best Overall
The Krypton 2 FXG50 is the clip-on that should be in your gear loadout for when identification at distance decides whether you take the shot or not. A 640×480, 12 µm sensor behind a fast F50/1.0 lens preserves detail when you run your day scope at 2–6×. Detection ranges up to approximately 2,300 m, which translates to confident identification of coyotes well beyond typical farm-field distances.
Mounting is straightforward. The PSP-B ring adapters (42/50/56 mm) are sized to your scope’s objective bell. Once set square and torqued correctly, you can clip on/off without touching your turrets, keeping your daytime zero intact.
This clip-on favors any open pasture, field edge, and several other spots you may be hunting. In cold, dry air, the FXG50 maintains a clear sight picture when the magnification is bumped up for a better aiming point.
Who’s this for:
- You hunt predators or wild boar across open fields, ridgelines, or crop zones.
- You want crystal-clear longer-range detail and the ability to identify game at significant distances.
- You often shoot in cold, dry conditions where visibility is high and precision is key.
- Your setup is a bolt-action or precision rifle, and you value image stability over compact size.
In short: FXG50 gives you reach, definition, and confidence to take distant, ethical shots when range decides the outcome.
Key specifications:
- Thermal sensor: 640 × 480 px, 12 µm, < 20 mK sNETD — captures subtle heat differences for clearer target separation in fog, drizzle, and cold mornings.
- Objective lens: F50 / 1.0 fast-aperture Germanium lens — maximizes light transmission and long-range clarity in low contrast conditions.
- Detection range: Up to 2,300 m (1.8m tall target) — reliable identification of boar, coyote, or red deer well beyond typical shooting distances.
- Field of view @100 m: 8.8 × 6.6° (≈ 15.4 × 11.5 m) — wide enough for situational awareness, tight enough for accurate aiming.
- Display: HD multicolor AMOLED — sharp, high-contrast imaging with smooth 50 Hz refresh for tracking fast movement.
- Power system: Quick-swap IPS7 rechargeable battery, up to 11 hours of runtime at 22°C — supports full-night sessions without interruption.
- Build quality: Rugged magnesium alloy housing, fully IPX7 waterproof — field-proven against rain, mud, and recoil shock.
- Connectivity: Stream Vision 2 Wi-Fi (iOS/Android) — enables remote control, video streaming, and photo recording directly to your smartphone.
Strengths:
- Exceptional long-range precision — delivers clear, detailed thermal images at extended distances for confident identification before the shot.
- Unmatched performance in poor visibility — maintains contrast and definition through fog, drizzle, and cold weather when others fail.
- Stable and repeatable accuracy — the PSP-B quick-mount system ensures perfect alignment every time you clip it on or off.
- Proven reliability in harsh environments — rugged magnesium body and waterproof design endure rough terrain, rain, and recoil with ease.
- Optimized for extended hunts — long-lasting power and ergonomic balance make it ideal for long nights in the field.
Main considerations:
Performs best in open terrain where long sightlines are common — hunters who mainly stalk in dense forest or short-range cover may find the FXQ35’s wider view more practical.
The front-mounted design adds some weight toward the muzzle; balancing the rifle with a stable rest or bipod ensures optimal comfort on longer sessions.
Use-cases / Hunting scenario:
- Open fields & plains: Confident identification and ethical shots on boar and predators at significant distances.
- Long ridge lines & pasture edges: Extended 2.3 km detection capability gives hunters time to plan the approach.
- Cold, dry climates: High resolution preserves fine detail.
- Team hunts: Reliable clip-on transition allows one optic for day and night roles.
Our expert experience & field test results – what Riccardo thinks of the Krypton 2 FXG50:
The Krypton FXG50 is a super versatile thermal device because of its great image quality and overall performance. Its comfort zone is the open field, where it’s possible to have a long-range shooting. The quality of the sensor and the 12 µm pixel pitch assure the top precision also with small targets.
We know that the clip-on works better between 2x and 4x of magnification; at first sight, this could be a limit. If you like to have more magnification by moving the daytime scope wheel, it can be possible to go over, but not more than 6x: the FOV will be dramatically reduced, and the menu options or the display info could be hidden from the hunter’s eye.
Verdict:
The Krypton 2 FXG50 is a professional-grade thermal clip-on built for long-range precision and clarity. With a top-tier sensor, fast optics, and a proven mounting system, it’s ideal for hunters who demand confident target ID in open terrain and challenging conditions. If your priority is range, stability, and accuracy under demanding hunts, the FXG50 delivers.
Read more:
- Get your Krypton 2 FXG50: Find a local dealer
Krypton 2 FXQ35 — Best for compact balance and mixed terrain
The Krypton 2 FXQ35 trades raw reach for agility. A 384×288, 17 µm sensor with an F35/1.0 lens gives you a wider FOV (≈10.7°) and 1,350 m detection. It doesn’t possess the reach that the FXG50 does, but it’s perfect for hunting forests and for those foggy or humid nights when contrast gets mushy. It’s lighter at the muzzle and more forgiving as you scan thick cover.
The setup is the same as the FXG50: PSP-B ring adapters, square alignment, and you can clip on and off in seconds with point-of-impact stability. Keep the day scope around 2–4× for a clean sight picture and plenty of situational awareness.
The FXQ35 keeps rifles lively, especially AR-15s and light sporters. Its higher thermal sensitivity suits wetter air and mixed terrain where quick pickups matter more than absolute reach.
Who’s this for:
- Hunters who often stalk boar, fox, or deer in forests or farmland.
- Those who need fast target pickup in fog, drizzle, or heavy vegetation.
- Shooters running light rifles or AR platforms who value balance and low muzzle weight.
- Hunters who prioritize mobility, battery life, and fast transitions over extreme long-range performance.
In short: FXQ35 delivers speed, comfort, and reliable contrast where visibility is the hardest and conditions shift from open to wooded ground.
Key specifications:
- Sensor: 384 × 288 px, 17 µm, < 20 mK sNETD — sharp contrast and reliable detail in humidity and low visibility
- Lens: F35 / 1.0 fast-aperture Germanium lens — wide and bright view for forest and mid-range hunts
- Detection Range: Up to 1,350 m (1.8 m tall target) — ideal for typical woodland or farmland distances
- Field of View @100 m: 10.7 × 8° (≈ 18.7 × 14 m) — wide enough for scanning dense cover
- Display: AMOLED HD (1920 × 1080) — smooth 50 Hz imaging for moving targets
- Power System: IPS7 Li-ion battery, up to 11 hours runtime @22°C
- Housing: Magnesium alloy body, IPX7 waterproof, -25°C to +50°C operating range
Strengths and limitations:
- Excellent image contrast in fog, drizzle, and humidity, maintaining visibility where standard optics lose definition.
- Wide field of view for fast scanning and reliable target detection in forests or mixed terrain.
- Lightweight and perfectly balanced, keeping your rifle agile and comfortable during long stalks.
- Stable, repeatable mounting system that preserves point of impact even after multiple attachments.
- Rugged and weatherproof construction designed to perform in rain, mud, and changing temperatures.
- Long battery life and efficient power system, ideal for extended hunts and unpredictable conditions.
- Fast, intuitive operation, allowing quick target acquisition and smooth transitions from scan to shot.
Use-cases / Hunting scenario:
- Woodland stalking: detect boar or deer moving through cover with a wide, clear thermal view.
- Mixed terrain hunts: track game transitioning between forest edges and open pasture.
- Foggy or humid nights: maintain strong image contrast where standard optics fail.
- Mobile hunting setups: ideal for ARs or light bolt-actions where balance and fast handling are key.
Our expert experience & real test results:
Sometimes, the hunter doesn’t need super shooting performances, and they like to have an affordable and reliable device to get an animal during the night. Krypton 2 FXQ35 is the right answer for those who prefer to go hunting with an AR platform rifle or a semi-auto, which both have a short barrel.
Short barrels make the rifle handier, above all, during stalking, but it pays the due with long-distance shooting precision. It’s the best choice if the hunter needs to place a precise shot within 150-180 mt. I always suggest using a clip-on with another thermal scanner because the possibility of moving it when mounted on the rifle is very limited; but with this, the hunter will always have the environment around them under control. FXQ35 is also one of the best quality/cost ratio devices in the Pulsar range.
Verdict:
The Pulsar Krypton 2 FXQ35 is a compact, well-balanced thermal clip-on built for hunters who value agility, speed, and reliable performance in unpredictable conditions. Its wide field of view and high thermal sensitivity make it exceptionally effective in forests, farmland, and humid or foggy weather — situations where visibility often fails conventional optics.
Designed for lightweight rifles and AR platforms, it keeps your setup mobile without sacrificing image clarity or stability. The FXQ35 isn’t about extreme distance — it’s about precision, comfort, and awareness in real hunting environments.
Read More:
- Get your Krypton 2 FXQ35: Find a local dealer.
Clip-on comparison: Krypton 2 FXG50 vs FXQ35
| Feature | Krypton 2 FXG50 | Krypton 2 FXQ35 |
|---|---|---|
| Thermal sensor | 640×480 / 12 µm — higher image resolution and longer-range precision. | 384×288 / 17 µm — balanced performance with excellent contrast at mid-range. |
| Sensor sensitivity | < 40 mK — best in cold, dry climates with high heat contrast. | < 25 mK — excels in humidity, fog, and low-contrast backgrounds. |
| Objective lens | F50 / 1.0 — long-range reach and fine detail in open terrain. | F35 / 1.0 — wider and brighter FOV for dense terrain. |
| Field of view @ 100 m | 8.8 × 6.6° ≈ 15.4 × 11.5 m — narrow for precision. | 10.7 × 8.0° ≈ 18.7 × 14 m — wider for scanning. |
| Detection range (1.8 m target) | Up to 2,300 m — long-range / open field. | Up to 1,350 m — mid-range / mixed terrain. |
| Image clarity | High detail for precise shot placement at distance. | Exceptional contrast in humidity, fog, or rain. |
| Handling & balance | Slightly front-heavy — ideal for bolt-action or tripod setups. | Lightweight & compact — great for AR platforms and stalking. |
| Battery life | Up to 11 h (IPS7 pack). | |
| Mounting system | PSP-B quick-release bayonet (42 / 50 / 56 mm) — precise, repeatable zero. | |
| Best for | Open fields, long-range predator or boar hunting, precision shooting. | Forests, farmland, foggy nights, fast-moving targets in mixed terrain. |
| Key advantage | Maximum range & image definition. | Compact balance, faster acquisition, superior humid-weather contrast. |
Summary
- Choose the FXG50 → when distance, detail, and long-range precision are your top priorities.
- Choose the FXQ35 → when agility, comfort, and performance in humidity or mixed terrain matter most.
Key features that matter in clip-ons
When choosing a thermal clip-on scope, focus on the features that directly affect detection range, image clarity, and shot confidence.
A good clip-on should integrate seamlessly with your day scope, maintain reliable image performance, and adapt to your typical hunting conditions.
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Thermal sensitivity and resolution
These are the two most important factors behind image quality.
- Thermal sensitivity (NETD) determines how well the device detects subtle temperature differences — the lower the NETD value, the better the image contrast in fog, drizzle, or humidity.
- Sensor resolution defines the level of detail. Higher-resolution sensors give sharper long-range identification, while lower resolutions often provide a wider field of view for close or mixed terrain hunts.
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Lens speed and field of view
The lens aperture (e.g., F1.0) and size set the balance between range and situational awareness.
- Larger lenses extend detection distance but narrow your view.
- Smaller lenses offer a broader field of view, ideal for forests and fast-moving game.
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Display and refresh rate
A high-quality AMOLED display and a 50 Hz refresh rate ensure smooth motion tracking and clear imaging of moving targets.
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Mounting precision and zero stability
A secure mounting system is essential for repeatable accuracy.
Quick-release adapters allow fast attachment and removal without losing your point of impact — a key advantage during active hunts or gear changes.
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Power system and battery life
Look for a clip-on with a quick-swap battery system that lasts through a full night of hunting.
Efficient power management ensures consistent performance even in cold weather.
An extra note from Riccardo:
Although Pulsar clip-ons don’t require separate zeroing, I always suggest going to the shooting range to test the day scope + front attachment before going hunting.
Related: Thermal clip-ons vs thermal scopes
Common mistakes to avoid with clip-ons
Even the best thermal clip-on can underperform if not used correctly. Avoid these common setup and field mistakes to get the most out of your gear.
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Overusing magnification
Running your day scope at 8–10× drastically reduces your field of view and strains the thermal sensor.
Keep magnification between 2–4× for optimal image clarity and tracking.
Always confirm you have a clear, stable sight picture before taking the shot.
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Misaligned adapters
Improperly leveled adapters are a frequent issue that leads to accuracy problems.
Take time to mount your PSP-B adapter square and secure it firmly before the hunt.
Once correctly aligned, you can clip on and off repeatedly without shifting your point of impact.
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Ignoring focus adjustments
Thermal focus isn’t “set and forget.”
Adjust your focus for the expected shooting distance, and recheck as temperature or humidity changes.
A properly focused image ensures cleaner identification and more confident shot placement.
Our expert Riccardo names one more common mistake – using the attachment in the wrong situations:
The night brings a lot of problems: darkness, cold, fog, and rain work all together to worsen the situation. It’s better to reduce all the things you have to do to a minimum. This is why I recommend using the clip-on as a thermal scanner only when the hunter is out for observation, and as an aiming system only when they’ll be out with a rifle to cull the right animal.
Pro tip: Preparation in daylight saves frustration in the dark. Calibrate, align, and focus your clip-on before heading into the field — every successful night hunt starts with good setup.
How to choose the right clip-on for your rifle and hunt
Choosing the right thermal clip-on comes down to terrain, distance, and conditions.
Terrain & distance
Hunt in open fields or long-range setups? Choose a high-resolution clip-on for detail and identification beyond 250–300 yards.
Hunt in forests, farmland, or humid weather? Choose a high-sensitivity model with a wider field of view for quicker target pickup in fog, rain, or mixed cover.
Magnification setup
Keep your day scope at 2×–4× for optimal clarity and field of view.
You can briefly increase to 6×, but avoid high magnification — it narrows your FOV and degrades image quality.
Mounting & zero stability
A precise adapter system is essential. Ensure the mount is square, tightened to spec, and tested at the range.
When installed correctly, clip-ons retain zero — no re-sighting needed between uses.
Power & runtime
Choose a unit with quick-change batteries that last through long sessions (≈10–11 hours).
Keep a spare battery warm in cold weather to maintain power throughout the night.
In short:
Select a clip-on that matches your terrain and range, mount it precisely, and optimize your magnification for clarity — this combination ensures stability, accuracy, and confident shots in the dark.
Related: How to choose thermal riflescope for your hunting needs
Field-proven setups that work
- Open country: .243 Win or 6 mm ARC bolt gun, 2–12× day scope at 3×, Krypton 2 FXG50, tripod or tall bipod.
- Mixed terrain: .223/5.56 AR-15, 2–10× day scope at 2.5×, Krypton 2 FXQ35, sling + a rear bag for quick kneeling or prone shots.
- Teamwork: The Telos LRF XP50 handheld runs the scan; the shooter stands ready with the Krypton 2 clipped on. Axion XG30 Compact rides in a jacket pocket as the spare/backup spotter.
Final thoughts
Choosing the right thermal clip-on scope ultimately comes down to how and where you hunt.
If your nights stretch across open fields and long sightlines, the Krypton 2 FXG50 delivers the clarity and precision needed for confident identification at extended ranges.
If you prefer forests, farmland, or humid conditions, the Krypton 2 FXQ35 offers a lighter build, wider view, and faster handling when visibility turns difficult.
Both models transform your day scope into a reliable night-hunting system — fast to mount, accurate, and repeatable.
For the most efficient setup, pair your clip-on with a handheld thermal scanner to cover ground quickly, locate heat signatures, and make every shot count.
Before heading out, always check local hunting regulations and visit an authorized Pulsar dealer to ensure perfect fit and alignment with your rifle.
When properly chosen and prepared, a thermal clip-on becomes more than an accessory — it becomes your edge in the dark.
FAQ
Are clip-on thermals legal?
Legality depends on your country or region. In most European countries and the U.S., thermal clip-ons are legal for observation and permitted hunting under specific local regulations. Always check your national and regional hunting laws before use.
What makes a thermal clip-on scope different from standard scopes?
A thermal clip-on attaches in front of your existing day scope, converting it into a night-capable thermal system without re-zeroing. Unlike a standalone thermal scope, it lets you keep your familiar optics and reticle setup for both day and night hunts.
Can clip-on thermals be used in daylight?
Yes. Thermal devices detect heat signatures, not light, so they work in full daylight, at dusk, or complete darkness. However, their main advantage shows in low-visibility conditions like night, fog, or heavy cover.
Will a clip-on hurt my daytime zero?
Not if you attach the adapter right. The PSP-B system is designed for repeatable alignment. Set it up square and level, applying the specified torque. Verify your zero at the range before heading out for a hunt.
Further Reading:
About the experts
Joshua Skovlund has covered stories for Task & Purpose, Outdoor Life, and Coffee or Die Magazine. He has photographed and filmed multinational military exercises and hunting trips in austere environments around the world, with his first archery kill in Kona, Hawaii.
Joshua grew up in South Dakota, learning how to scout and hunt deer, turkey, pheasant, and waterfowl. He currently scouts and hunts black bears, turkeys, and deer, while taking every opportunity to go to the range and further hone his pistol and rifle shooting skills.
Riccardo Tamburini is a lifelong outdoorsman, hunter, fisherman, and professional wildlife photographer and filmmaker.
With over 35 years of experience across plains and mountains in Italy and abroad, he combines field expertise with a mechanical engineering background to explain the technology behind rifles, optics, and digital devices.