Athlon Cronus ATS 35M-400 Thermal Monocular — 400x300, 35mm

The Athlon Cronus ATS is a 400x300 handheld thermal monocular built for scanning open country fast. It is one of the lightest thermal monoculars on the market at 12.3 oz, which means it rides in a chest pocket all night without you noticing it is there.

A Higher-Resolution Sensor At A Mid-Range Price

Most thermal handhelds in this price bracket ship with a 384x288 sensor. The Cronus ATS runs 400x300 at a 12µm pixel pitch, which gives you more thermal data per frame and a claimed detection range beyond 3,000 yards for a heat signature the size of a person or large animal. Realistic identification distance on game-sized targets runs well under that, but the extra resolution shows up where it matters — telling a coyote from a stump at distance, or picking a bedded animal out of brush that would blur together on a coarser sensor.

The NETD rating sits at ≤50mK, which is higher (less sensitive) than premium 640-class units. In good conditions that is a non-issue. In heavy fog or right after rain, when everything in the scene is closer to the same temperature, a lower-NETD unit will still out-resolve it. Know that trade-off going in.

Built-In Laser Pointer, Not A Rangefinder

This is the 35M-400 — the standard Cronus ATS monocular with a visible laser pointer for marking a target in the dark, not the 35ML-400 with an integrated laser rangefinder. If you need distance readings built into the unit, look for the ML variant instead. For most scanning and scouting use, the pointer alone does the job of directing a hunting partner's eyes to what you are seeing.

Field Practicalities

The 0.23" OLED display runs at 640x400 and cycles through five color palettes — white hot, black hot, red hot, iron red, and blue hot — with adjustable brightness and contrast for each. A 35mm F1.0 lens pulls in enough light for a bright, workable image even in poor weather, and IP66 water resistance covers rain and dust without hesitation.

Battery life runs up to nine hours on a single cell, with a spare battery included and a USB-C external power option for longer sits. The Athlon Thermal app connects over Wi-Fi for recording video, saving stills, and reviewing footage afterward — useful for confirming what you actually saw once you are back at the truck.

Key Specifications

• Thermal Sensor: 400x300, 12µm pixel pitch
• NETD: ≤50mK
• Objective Lens: 35mm F1.0
• Magnification: 2.6x base, 10.4x combined
• Display: 640x400 OLED, 0.23"
• Detection Range: Up to approximately 3,000 yards
• Recognition Range: Approximately 1,500 yards
• Weight: 12.3 oz
• Battery: Up to 9 hours, spare battery included, USB-C external power
• Weather Rating: IP66
• Connectivity: Wi-Fi, Athlon Thermal App
• Warranty: Athlon lifetime transferable warranty, no receipt or registration required

Worth Knowing Before You Buy

The advertised 3,000-yard detection range means "a heat source is visible," not "you can identify what it is." Treat detection and recognition ranges as separate numbers, and expect real-world performance to fall well short of both in humid or wooded terrain. As with any thermal optic, check your state's regulations before using it for hunting — rules vary significantly by state and by species.