WonderPana 145 Core Filter Holder with Lens Cap for Canon 17mm TS-E Super Wide Tilt/Shift f/4L Lens Premium Grade Anodized Aluminum WonderPana 145 Core Unit for the Canon 17mm TS-E Super Wide Tilt/Shift f/4L Lens All metal build  Mounts like a lens hood; Ultra wide angle construction to eliminate vignetting Ability to mount a variety of 145mm & 6.6" wide graduated filters: UV, CPL, MC-CPL, ND4/8/16/32; 0.6 & 0.9 Hard & Soft Edge, Reverse & Color Grads Doubles as a hood to help protect your lens from damage, scratches, fingerprints and the elements 24 Month Manufacturer Warranty