No, the optic will continue to be zeroed at the distance you zeroed it at regardless of magnification, although it is always wise to reconfirm zero after altering the optic in any way.
Hey “Gear Expert” I wasn’t talking about the optic holding zero I was asking/referring to the accuracy of the BDC with the magnifier attached, the BDC the Bullet Drop Compensator. Is it still a true BDC with the magnifier because the BDC is calibrated for 8x not 16x....make sense?