I had a cheap Tasco on my Stevens that failed, so I figuered now is the time to bite the bullet and spend some money. I bought a Zeiss conquest, done deal right, wrong. I mounted it up and tried to bore sight it, and the cross hairs were way to the left of aim, and did not move with windage adjustment. I was having a bad night by now. I brought it back right away and got a Nikon monarch instead. Everything is fine with the world again. I have had scopes fail in the past, but I never thought a Zeiss. I guess it's true, even the best can have a bad one. Just my luck to find it.