How far you can see a person

112 m make out detail182 m tell what it is729 m spot it┆ maker’s claim

501002005001k2k5k m

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

ATN quotes 1,440 m, 2× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

ATNHandheld monocular · 640-class

ATN ODIN LT 640 3-12x

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Best for

Walk-and-scan glassing from a jacket pocket

01Specifications

As published by ATN. Sources: atncorp.com (product page + compare API, ODIN LT manual; ATN list $3,195).

Sensor: 640×480
Pixel pitch: 12 µm
NETD: ≤15 mK
Refresh rate: 60 Hz
Lens: 35 mm
Base magnification: 3×
Digital zoom: up to 12×
Field of view: 12.6° horizontal
Display: 1280x960
Claimed detection: 1,440 m
Claim basis: human-sized target (ATN product page 1580 yd; ATN manual labels it 'Human Detection Range')
Run time: 2.5 h
Battery type: CR123
Weight: 12.1 oz
Length: 5.7″
Laser rangefinder: No
Ballistic calculator: No
Records video: No
Wi-Fi: No
Warranty: 5 years
Country of origin: USA
Approx. price: ~$2,895

From the published specs, not owner reports.

For it

640×480 sensor, 2.8× 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)
Smooth 60 Hz picture on a running animal
Takes CR123 batteries you can swap in the field
Warranty: 5 years

Against it