Fully coated lenses and BK-7 prisms round out the list of features on one of Tasco's most powerful zooms. The versatile full size Essentials 16 x 50 mm. Porro Prism Binoculars gets you close to the action with the flick of a finger. The rugged, weather-resistant design makes these ideal for sporting events or any outdoor activity. The multicoated optics deliver clear, crisp images.