Maybe the title should read...I tried to save a buck and got what I deserve, stupid me? I purchased a bargain grade 28-70mm F2.8 AFS lens. Upon inspection I've found a tiny scratch in the front element. I've had a chance to take a few pics attached to my D2X. The pics do not show any signs of the imperfection. I paid $695.00 and have the option of returning for a full refund minus shipping. What tests should I do to put my mind at ease? or should I just return the lens and go for a better grade?