The BlazeHunter 635 LRF runs a 640×512 core at 12 µm behind a 35 mm lens; the ThOR 5 LRF 640 2-16x runs 640×480 at 12 µm behind 25 mm. The BlazeHunter 635 LRF has 1.1× the pixels. On the Johnson yardstick they detect a person at 729 m and 521 m and recognize one at 182 m and 130 m; the boxes say 1,830 m and 2,470 m. The BlazeHunter 635 LRF is lighter by 21.5 oz. Approximate prices are ~$1,895 and ~$2,995.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
ATN BlazeHunter 635 LRF640×512 · 12 µm · 35 mm
112 m identify182 m recognize729 m detectbox says 1,830 m (unspecified (2000 yd))
ATN ThOR 5 LRF 640 2-16x640×480 · 12 µm · 25 mm
80 m identify130 m recognize521 m detectbox says 2,470 m (human (ATN product page 2700 yd; ATN manual lists 1250))
501002005001k2k5k m
Estimated from pixel pitch and lens focal length using the Johnson criteria (2, 8 and 13 pixels across a 0.5 m human critical dimension), clear air, 50 % probability. A model of the optics, not a measurement — real range depends on temperature contrast, humidity and the animal.