How far you can see a person

80 m make out detail130 m tell what it is521 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 1,140 m, 2.2× 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 2-8x

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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 $2,995).

Sensor: 640×480
Pixel pitch: 12 µm
NETD: ≤15 mK
Refresh rate: 60 Hz
Lens: 25 mm
Base magnification: 2×
Digital zoom: up to 8×
Field of view: 17.6° horizontal
Display: 1280x960
Claimed detection: 1,140 m
Claim basis: human-sized target (ATN product page 1250 yd; ATN manual labels it 'Human Detection Range')
Run time: 2.5 h
Battery type: CR123
Weight: 10.1 oz
Length: 5.2″
Laser rangefinder: No
Ballistic calculator: No
Records video: No
Wi-Fi: No
Warranty: 5 years
Country of origin: USA
Approx. price: ~$2,695

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
Light at 10.1 oz, 22nd-lightest of the 112 handhelds here
Warranty: 5 years
Wide 17° view for scanning a field

Against it