The bushnell excursion ex hd 8x42 binoculars offer a wide field of view and highest level of edge to edge clarity through fully multi coated optics and bak 4 prisms with a pc 3 phase coating this precision viewing system is contained in a lightweight double bridge housing thats nitrogen purged and fully sealed against all forms of moisture then wrapped in rubber armour its sleek lines and balanced feel are enhanced by a rugged yet lightweight composite chassis