These Docter Optic ED 40x80 super wide angle binoculars feature an open hinge to connect the two halves of the body, one-hand "through grip", special extra-low dipersion glass lenses to reduce color dispersion, Docter multitop broadband coating for high-contrast images, click-stop twist up eyepieces, and a large exit pupil focus length. Noblex | Docter Optics Aspectem 40x80mm ED Super Wide Angle Binocular with backpack