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This RevoRing Swift Magnetic Variable Adapter Ring from H&Y Filters can be quickly and easily attached to lenses with 67-82mm filter threads, allowing select Swift System magnetic accessories to be attached in just seconds. It features unique self-retracting blade technology with threaded ends to secure on the front of a lens. Each threaded end has been designed to overlap, removing any possibility of light leak. This adapter is compatible with all magnetic B Modules like bridge rings, the drop-in filter rack and magnetic VND filters.