Amazon.com : JJC Hand-held White Balance Filter, White Balance Disc for Digital Photography, Easy to Use, Consistent Accurate color, for Lens Filter Diameter up to 95mm : Photographic Light Meters : Electronics
ITG Profilter Performance Air Filter WB-370 – itgfilters.net
Amazon.com : JJC Hand-held White Balance Filter, White Balance Disc for Digital Photography, Easy to Use, Consistent Accurate color, for Lens Filter Diameter up to 95mm : Photographic Light Meters : Electronics
ExpoDisc 2.0 - Professional White Balance Filter – Rogue Photographic Design
ITG Profilter Performance Air Filter WB-447 – itgfilters.net