AGM ObservIR LRF 50-640 — 640×512 thermal binocular

How far you can see a person

160 m make out detail260 m tell what it is1,042 m spot it┆ maker’s claim

501002005001k2k5k m

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

AGM Global Vision quotes 2,600 m, 2.5× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

AGM Global VisionBinocular · 640-class · Laser rangefinder

AGM ObservIR LRF 50-640

Approx. price: ~$4,995
Sensor: 640×512 · 12 µm
Lens: 50 mm · 4.5×
Weight: 29.3 oz

We may earn a commission. Price and availability on Amazon’s site may differ.

Best for

Long sits over open ground, glassed with both eyes

01Specifications

As published by AGM Global Vision. Sources: agmglobalvision.com (product page, 2026 catalog), downloads.agmglobalvision.com (datasheet).

Sensor: 640×512
Pixel pitch: 12 µm
NETD: <15 mK
Refresh rate: 50 Hz
Lens: 50 mm
Base magnification: 4.5×
Digital zoom: up to 20×
Field of view: 8.8° horizontal
Display: 1920x1080 OLED
Claimed detection: 2,600 m
Claim basis: 6 ft (1.8 m) object
Run time: 8.5 h
Battery type: Removable pack
Weight: 29.3 oz
Length: 9″
Laser rangefinder: Yes
Ballistic calculator: No
Records video: Yes
Wi-Fi: Yes
IP rating: IP67
Warranty: 5 years
Approx. price: ~$4,995

02Pros and cons

From the published specs, not owner reports.

For it

640×512 sensor, 3× the detail of an entry-level 384
Sensitive sensor that picks out small heat differences on humid or rainy nights (the best of 285 that publish it)
Built-in laser rangefinder
Swappable battery pack, so a spare doubles the run time
8.5 h of battery
Waterproof (IP67), survives a dunking
Records video and connects to a phone app

Against it