I had a 2x lens on my Viper sight a few years ago and it cost me a shot at a nice 8 pt.What happened was when I came to full draw and attemted to sight in on the buck,the sun reflection on the glasscompletely blocked my view.Couldn't see a thing with the sun at the angle it was on.Meanwhile this good buck is standing broadside at 15 yards in the wide open.Finally after the deer walked off I took the lens outright then and there and never used it again.That was the first season I ever tried a lens....and it has been the last.Didn't need it anyway;just wanted to try something different.I should've known:If it aint broke don't fix it.