THESE scopes are spot on,my only gripe,but i can live with it.is the parralex,mine has been factory set at 100yrds,and today a friend of mine g.l.w tryed to reparrellex it, to a range more suited for hft ranges. it did come down a bit,but we just couldnt get it to drop in to spot on focus,we tryed this with the mag set on 10x,its moved a quarter turn and has improved it a lot.but not exact.saying this though,a few club members had a look through it,and found it to be ok,but each person was differant.and did have to fine focus the rear ocular,to keep the ret on the same line.its worth attempting,as it does come down a fair bit,but to get it spot on crystal clear,i think it is a factory job.as the class can only move so far forward and backwards.as it is restricted by a thread insert,fitted by ziess.even so this scope is fantastic in low light levels its unreal.my idea of a perfect ft scope? leupold range finding and ziess glass