after buying a 10x42 i was sitting on the fence and almost sold it to buy a eb sniper because the paralax error i was getting at 13yrds on a 15mm kill was ridiculas only knocking the target down 1 or 2 times out of 20 but just as i was about to give up on the scope a friend at MAD suggested a few things and we repositioned my cheeck piece and i was knocking the target down EVERY time , and i went straight out and shot my PB with it . id definatly say that the key to this scope is getting your eye in the exact right spot more so than my viper or you will suffer BAD paralax error , now i have this sorted im very happy with the scope . very nice optics