Amazon.com : WonderPana Absolute Core for The Tokina 16-28mm f/2.8 at-X Pro FX Lens (Full Frame 35mm) - 130mm Adapter Ring (for Cokin X-Pro), 150mm Adapter Ring (for Lee SW-150) and 145mm
WonderPana Filter Holder Step Up Ring 77mm-145mm – Fotodiox, Inc. USA
Review Of The Fotodiox Wonderpana 145 Adapter Kit For The Nikon 14-24mm Lens - YouTube