At the core of Terra ED are fully multicoated SCHOTT ED glass lenses designed to maximize light transmission and render contrast-rich images. They also boast the ability to focus down to less than 6 ft, allowing observers to get up close to the bird or other nearby subject of interest Thanks to a space-saving Schmidt-Pechan roof prism design and lightweight composite housing, this binocular weighs just a pound and a half.
Complementing the high-transmission optical path and modest form factor, the Terra ED has a nitrogen-filled housing that provides fogproof performance and has been tested to withstand submersion to a depth of approximately 3 ft. This water and fogproof performance, coupled with a broad operating temperature range, enables these binoculars to stand up to almost any outdoor observational situation. A textured center focus wheel and twist-up rubber eyecups supply additional handling features that enhance the overall ergonomics and help make it a full-featured binocular for close to mid-range use.