Is 48° x 72° vs factory 15° x 25°. This lens sees 15 times more FOV than factory! Install is simple and i have included the tools to do the install. You'll need to provide the adjustible pipe wrench to unscrew main lens housing. I have a youtube video that details the install. Gives pvs-14 style FOV to the NVG-10. Also included is the 100% invisible iR flip cap Which makes your NVG-10 the ONLY truely invisible digital scope on the market! Human eyes cant see the iR at all when flipped down. In a seperate item for sale is a sideways mount to increase vertical FOV from 48° to 78°. ...