The Hound H635R runs a 640×512 core at 12 µm behind a 35 mm lens; the Hydra HS635 runs 640×512 at 12 µm behind 35 mm. The Hound H635R is lighter by 2.8 oz. Approximate prices are ~$2,000 and ~$2,550.
How far you can see a person
Make out detailTell what it isSpot itMaker’s claim
DNT Optics Hound H635R640×512 · 12 µm · 35 mm
112 m make out detail182 m tell what it is729 m spot it
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.