Super Scope Dual Lens with a 8 power 0.312 center lens size. The lens gives you two different views. The base lens is our standard 2 power Excalibur Tuff Glass Lens. Both parts of the lens are optically centered, which is a very important factor when picking a lens to shoot in a scope. The Dual Lens allows you to magnify just the X ring or the very spot you are shooting at, and also gives some magnification to the rest of your target. The Super Scope lens measures 1.345" (approximately 1 3/8"). Field of view includes nearly the entire X-ring on the NFAA targets and nearly the entire 10 ring on Vegas targets. For use with the 040-1, 040-1BLK, and 040-3 scopes..