Pack In Viewing Power. When details are what counts, the 10×42 Viper binocular with X-Factor vision is a fine choice for long-range scanning. Vortex Optics warranty is straightforward because they want you to use and enjoy your optics with complete confidence. Rest assured that if any Vortex Optics product should ever require service, Vortex will repair or replace the product absolutely free! No warranty card to fill out. No time limit on our promise. No restrictions on coverage … even if you transfer ownership of the product.