... adapter ring thread diameter:37-30.5mm 37-30mm,37-34mm,52-58mm,55-58mm,etc. camera accessories lens adaptor step ring ... different size of step-up adapter ring and step-down adapter ring for your selection.Camera adapter ring is used between camera( ... wide angle lens ,fisheye lens,and so on.Adapter rings are labeled form the camera to the filter ... -34mm,52-58mm,55-58mm,etc.Adapter ring /Lens adaper /Camera ...