Fotodiox 145mm Slim Multi-Coated UV Filter for WonderPana 145 and 66 Systems Premium Grade Optical Glass Filter 145mm x 1mm Standard Thread, both in the front and rear Premium Grade Anodized Aluminum Filter Ring Other Available 145mm Filters include CPL, ND4, ND8, ND16 & ND32 Filters 24 Month Manufacturer Warrenty