I had just got my mk3 days before this huge event and already sold all of my Nikon gear and the filters I had weren't the same size of the lens I was using on the canon. I didn't have time to get a good one so this cheap one was my only option. I will be getting a good one when I can.
Ahhh, sorry I just cringe when I see that someone uses bad filters in front of good glass. I'm a purist when it comes to lenses... lol sorry :P