The Calonox 2 View runs a 640×480 core at 12 µm behind a 42 mm lens; the Telos LRF XP50 runs 640×480 at 17 µm behind 50 mm. On the Johnson yardstick they detect a person at 875 m and 735 m and recognize one at 219 m and 184 m; the boxes say 2,210 m and 1,800 m. The Calonox 2 View is lighter by 2.7 oz. Approximate prices are ~$4,899 and ~$3,700.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
Leica Calonox 2 View640×480 · 12 µm · 42 mm
135 m identify219 m recognize875 m detectbox says 2,210 m (1.7 m x 0.5 m subject at 2 px (Leica 'recognition' 770 m at 6 px))
Pulsar Telos LRF XP50640×480 · 17 µm · 50 mm
113 m identify184 m recognize735 m detectbox says 1,800 m (1.8 m object)
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.