Product picture - Canon Tripod Mount Ring C for 70-300mm f 4-5.6L and 28-300mm f 3.5-5.6L Lenses Canon, Tripod, Mount, Ring, C, 70-300mm, f, 4-5.6L, 28-300mm, f, 3.5-5.6L, Lenses Click the image to close this page