WonderPana 145 System Core & Lens Cap - 145mm Filter Holder for Canon 8-15mm EF f/4L Fisheye USM Zoom Lens (Full Frame) Premium Grade Anodized Aluminum WonderPana 145 Core Unit 145mm x 1mm Standard Thread Enabled Finely Crafted, Heavy Duty Inner Pinch Lens Cap Variety of 145mm Round Filters Available 24 Month Manufacturer Warranty