On my 3.5x TA11, 3.5x ELCAN and 4x TA01NSN I can barely make out the blur, they're all mounted on the receiver directly, without a #36 or #38 riser. On an SN4 (1-4x) mounted on a #36 riser, the front sight tower is prominently displayed on the bottom half at 1-2x, at 3x it's not so bad, at 4x it's just a little blur on the very bottom. At higher magnifications you won't notice it much.