High Qaulity 58mm To 52mm Step Down Ring By DragonFly Optical These allow you to put smaller or larger filter attachments on to you camera by either stepping up or down the filter size The first number is the size of your camera lens thread The second number will be the size of the filter or accessory lens you wish to attach Made from aluminium alloy. Suitable for: SLR & Bridge-type Cameras, SLR with wide-angle lens, Medium Format Cameras, Camcorder & Video Cameras and HDV Cameras