The ThOR LTV 640 3-9x runs a 640×480 core at 12 µm behind a 35 mm lens; the Hydra HS635 runs 640×512 at 12 µm behind 35 mm. The Hydra HS635 has 1.1× the pixels. The Hydra HS635 is lighter by 9.2 oz. Approximate prices are ~$2,595 and ~$2,550.
How far you can see a person
Make out detailTell what it isSpot itMaker’s claim
ATN ThOR LTV 640 3-9x640×480 · 12 µm · 35 mm
112 m make out detail182 m tell what it is729 m spot itmaker claims 2,290 m
DNT Optics Hydra HS635640×512 · 12 µm · 35 mm
112 m make out detail182 m tell what it is729 m spot it
501002005001k2k5k m
Calculated from the sensor's pixel pitch and the lens focal length, for clear air.