Designed to exacting standards and constructed with state-of-the-art materials, the Vivitar Series 1 binoculars are a premium product. Long eye relief and large exit pupils combine to make more comfortable extended viewing sessions possible by reducing eye strain. Multicoated optics decrease image and light refraction, as well as reduce flare, which results in enhanced resolution and image brightness, making your eyes work less in order to make out details. Reliable center-wheel focus design with separate ocular adjustment allows for compensation of vision differences between the users eyes.