My hensoldt Z24 or fero -z has the iluminator and the glass is crystal clear like the acogs i,ve looked thru. Holds zero on and off perfectly and the BDC knob on top,goes up to 6 for 600m. It works perfect once you zero it at 100 on the "1" setting. I turn it to the 4 setting with quality m-80 147-150 ball and the round hits dead center of a man sized target at 400yrds.I haven,t used it at 600 YET,but I,m gettin closer. You will still see these scopes used with the german army sniper units in pictures all over the web. Top shelf glass,but not made for target shooting per say. Its made for man sized targets like its intended to.MOST People think magnification is what matters,but the CLARITY of the glass is what makes a 4x ZEISS scope more accurate then a 9x ncstar,leapers barska ,etccc.. The list goes on. The Z24 works FLAWLESS.