If you want to keep the total weight of your equipment down and still keep the option open for long-distance viewing, you can increase the magnification of full-size Vortex binoculars (with the exception of the Kaibab), as well as the Recon R/T and Recon Mountain scopes, with the help of the Vortex Doubler. The Vortex Doubler can be easily attached to the eye cup.