PENTAX Binoculars Jupiter SeriesAn easy viewing, large aperture porro prism binocular series, assuring casual, clear observation in a wide range of applications, with a choice of four cost effective models. With the incorporation of large aperture objective lenses for improved light gathering power, the new series has been developed to provide a bright, clear field of vision for casual, effortless viewing in a variety of applications, even for first time binoculars users.