Superior quality, high-performance hunting optics, grasp the long distance power of the 10x42 Diamondback Classics as you close in on details missed by others Fully multi-coated on all air-to-glass surfaces increases light transmission while phase correction coating enhances resolution and contrast Center focus wheel adjusts the focus of both binocular barrels at the same time while the diopter (located on the right eyepiece) allows the user to adjust for focus differences between each eye Adjustable eyecups can be twisted up or down for comfortable viewing with or without eyeglasses. Rainguard, tethered objective lens covers, comfort neck strap, and deluxe custom-molded carry case are all included in the box Backed by our unlimited, unconditional, lifetime, VIP Warranty. A fully transferable promise to repair or replace your item if it becomes damaged/defective. Does not cover loss, theft, deliberate damage or cosmetic damage that doesn't hinder performance Objective Lens Diameter 42 mm