Add another dimension to your Viper spotting scope with this fixed eyepiece. On the 65mm scope you get a 25x magnification with a field of view of 150 ft./1000 yds. An 80mm scope will give you a 32x magnification with the field of view at 120ft./1000 yds. The Viper eyepiece features fully multi-coated lenses to deliver maximum brightness. No need to worry about harsh weather as this eyepiece features superior protection from fogproofing with argon gas purging and waterproofing with o-ring sealed optics. With the Vortex VIP warranty, the Viper eyepiece is meant to last for generations.