I got the VT-Z 4-16x44sf to try and to get it in focus I had to turn the Ocular eye piece just about all the way out to the point the flip up cap would not stay on very good plus the eye piece almost would turn by itself from having the flip up cap on so I had to put electrical tape to hold it in place but other then that it seems to be a decent scope for under 100.00 dollars, I got it just to see what all the hype was with the Discovery scope, I do think I will try a better Discovery FFP scope just to see how that works but for now I put the 4-16 on a 22lr untill I order another airgun to try it on, all my other airguns are scoped and zeroed in.