DNT Optics Hydra HS225 vs Sightmark Shade Thermal 3.5-28x30
The Hydra HS225 runs a 256×192 core at 12 µm behind a 25 mm lens; the Shade Thermal 3.5-28x30 runs 256×192 at 12 µm behind 30 mm. The Hydra HS225 is lighter by 8.8 oz.
How far you can see a person
Make out detailTell what it isSpot itMaker’s claim
DNT Optics Hydra HS225256×192 · 12 µm · 25 mm
80 m make out detail130 m tell what it is521 m spot it
Sightmark Shade Thermal 3.5-28x30256×192 · 12 µm · 30 mm
96 m make out detail156 m tell what it is625 m spot it
501002005001k2k5k m
Calculated from the sensor's pixel pitch and the lens focal length, for clear air.