... different size of step-up adapter ring and step-down adapter ring for your selection.Camera adapter ring is used between ... lens ,wide angle lens ,fisheye lens,and so on.Adapter rings are labeled form the camera to the filter.They ... 're made of metal-aluminum construction The 37-25mm adapter esaily screws onto the front of any 25mm Lens, ... -30mm,37-34mm,52-58mm,55-58mm,etc.Adapter ring /Lens adaper /Camera ...