The IR-HUNTER 35mm runs a 640×480 core at 12 µm behind a 35 mm lens; the REAP-IR 35mm runs 640×480 at 12 µm behind 35 mm. On the Johnson yardstick they detect a person at 729 m and 729 m and recognize one at 182 m and 182 m. The REAP-IR 35mm is lighter by 2.5 oz.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
Trijicon IR-HUNTER 35mm640×480 · 12 µm · 35 mm
112 m identify182 m recognize729 m detect
Trijicon REAP-IR 35mm640×480 · 12 µm · 35 mm
112 m identify182 m recognize729 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.