I got that filter a few weeks ago, just havent used it yet, to many lens problems.
BTW, I exchanged the 85mm 1.8 lens for another that will arrive tuesday. Hopefully it will be better. Canon wanted me to pay shipping for the warranty repair, so I said heck no and opted to use my return policy instead in hopes it was just a bad batch. Also heavily weighing dropping some cash on a 7D
