The ThOR 5 XD LRF 4-40x runs a 1280×1024 core at 12 µm behind a 100 mm lens; the REAP-IR 60mm runs 640×480 at 12 µm behind 60 mm. The ThOR 5 XD LRF 4-40x has 4.3× the pixels. On the Johnson yardstick they detect a person at 2,083 m and 1,250 m and recognize one at 521 m and 313 m. The REAP-IR 60mm is lighter by 13.6 oz. Approximate prices are ~$6,195 and ~$9,784.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
ATN ThOR 5 XD LRF 4-40x1280×1024 · 12 µm · 100 mm
321 m identify521 m recognize2,083 m detectbox says 3,660 m (human (ATN 'Human Detection Range', 4000 yd))
Trijicon REAP-IR 60mm640×480 · 12 µm · 60 mm
192 m identify313 m recognize1,250 m detect
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.