This Tokina kit bundles the super-wide Cinema ATX 11-20mm T2.9 Zoom Lens, in a PL mount, with three PRO IRND 86mm Filters. The round filters, featuring 1.5, 1.8, and 2.1 densities, thread into the front of the lens and neutralize IR contamination, reduce overall exposure, and produce reduced shutter-speed effects.