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A step down ring used for attaching B60 filters to the CFi 50mm lens, which has a front B70 mount. Only a single filter can be used at once.
Suitable for use on a lenses that have the 70mm bayonet filter mounting. Works with 50mm CFi, 110mm F/FE f2, 150 f2.8, and 250 F/FE lenses.