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The #313 Step-Down Ring from Heliopan permits the use of 52 filters on lenses with a Bay 56 mount. It features a durable brass construction to prevent jamming and binding, and it has a matte black finish to reduce reflections.
In the Box
Heliopan Bay 56-52 Step-Down Ring (#313)
Limited 5-Year Warranty, Extendable to 10-Years with Online Registration