The QUEST H35R runs a 640×512 core at 12 µm behind a 35 mm lens; the Merger LRF XL50 runs 1024×768 at 12 µm behind 50 mm. The Merger LRF XL50 has 2.4× the pixels. On the Johnson yardstick they detect a person at 729 m and 1,042 m and recognize one at 182 m and 260 m; the boxes say 1,800 m and 2,300 m. The QUEST H35R is lighter by 8.8 oz. Approximate prices are ~$3,650 and ~$8,000.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
Nocpix QUEST H35R640×512 · 12 µm · 35 mm
112 m identify182 m recognize729 m detectbox says 1,800 m (6 ft tall object)
Pulsar Merger LRF XL501024×768 · 12 µm · 50 mm
160 m identify260 m recognize1,042 m detectbox says 2,300 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.