DNT Optics put a laser rangefinder inside the Hydra, and that changes how you hunt with thermal. Range a hog the moment it shows in the 2-8x50mm image, get the distance on screen, and hold accordingly. No separate rangefinder, no light, no extra motion at the moment that usually blows a stalk.The 640 thermal core is the resolution that separates serious night hunting glass from entry level scanners, and the 50mm objective feeds it enough signal to find pigs and coyotes well past typical shooting distances. DNT has built its name on genuinely capable thermal for working hunters, and the Hydra LRF is the flagship expression of that in the current lineup.