Burris BTS35 v3 640 vs Steiner Nighthunter S35 Gen II
The BTS35 v3 640 runs a 640×480 core at 12 µm behind a 35 mm lens; the Nighthunter S35 Gen II runs 640×512 at 12 µm behind 35 mm. The Nighthunter S35 Gen II has 1.1× the pixels. On the Johnson yardstick they detect a person at 729 m and 729 m and recognize one at 182 m and 182 m; the boxes say 1,000 m and 1,830 m. The Nighthunter S35 Gen II is lighter by 11.0 oz. Approximate prices are ~$4,200 and ~$4,600.
Estimated range, standing human, clear air
IdentifyRecognizeDetectBox claim
Burris BTS35 v3 640640×480 · 12 µm · 35 mm
112 m identify182 m recognize729 m detectbox says 1,000 m (deer)
Steiner Nighthunter S35 Gen II640×512 · 12 µm · 35 mm
112 m identify182 m recognize729 m detectbox says 1,830 m (coyote/pig ('over 2,000 yards'; recognition 500 yd))
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.