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The adaptor ring screws onto the camera's lens and, in turn, the filter holder clips onto the adaptor ring.
The adaptor ring screws onto the lens with a fluid action, thanks to the sturdy construction and aluminium screw thread.
Standard adaptor ring
The standard adaptor ring is suitable for use with lenses up to a moderate wide-angle. It sits in front of the lens's front thread. The standard adaptor ring is compatible with lens focal lengths of approximately 24-28mm (35mm SLR equivalent) and upwards.