A great unit for both astronomical and long-range terrestrial use, the mil-spec Fujinon 10x70 MT-SX Poseidon Binocular transmits 95% of the light reaching the binocular, and has Fujinon's EBC multi-coatings on every optical surface. Its long eye relief makes them easy to use for long periods of time, while the impressive 7mm exit pupil ensures complete coverage when pupils are fully dilated in low or challenging light such as at night while stargazing, or at dawn and dusk, without vignetting. Individually focusing eyepieces ensure tack-sharp views by any user. The 100% fogproof and waterproof Poseidon withstands drastic temperature and humidity changes with ease.