With the Vortex Doubler you can increase the magnification of any full size Vortex binocular (except for the Fury and Kaibab) as well as the Recon R/T and Recon Mountain scopes. Take in high-magnification views more similar to what you'd see through a spotting scope. The Vortex 2x Doubler easily attaches over most Vortex binocular eyecups.