Yeah, the lens is so bulbous it doesn't have a filter thread. I've got a BMCC and I'm using 82mm NDs and IR cut (I won't ever use a mattebox), and as much as I'd like the 14-24, I can't get past the filter system. Look at the size of the filters!... And this link shows various filter options... http://www.ianplant.com/blog/2013/03/15/using-filters-on-the-nikon-14-24mm-and-other-ultra-wide-lenses/#sthash.AysobifT.dpbs