Enjoy a smooth zoom with the Tasco Essentials 10-30x50mm Porro Prism Binoculars, which provide the variable power you need for different scenarios. A lever near the right eyecup lets you control magnification, and a center wheel controls focus. The binoculars also feature BK7 Porro prisms and coated optics. The rubber eyecups fold down to accommodate your use of eyeglasses. An optional adapter can be used to mount the binoculars on a tripod.