I'm sighting in my new eotech holographic sight and I zeroed it at 50 yards. It shot very well out to 100. Now my quistion is I flipped the 3x magnifier down and shot it at 100 yards and it was off from where I had it with no magnifier. I asumed it was just a magnifier and wouldn't move my shot placement. I guess I was wrong. Do I have to zero with magnifier right from the start? I can't seem to wrap my head around it. Any help is appreciated.