An anti-reflective device that is to be attached to a variety of types or sizes of optical products via side members. The anti-reflective device is to be used on optical products such binoculars, monocular, rifle scopes, and spotting scopes, to prevent the return to an object of visible reflections of light emitted from the surface of the objective lens of an optical product. In a simple one-handed motion, the anti-reflective device is to be clamped to the external body of an optical product, used as an anti-reflective device, and removed via a simple one-handed motion.