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This Ewa-Marine 58mm Adapter Ring is the replacement inner ring for the Ewa-Marine C-A58 adapter ring set. This is the part that screws onto the lens.
The Ewa-Marine C-A58 adapter ring set is used to center the camera lens in an Ewa-Marine housing. The ring is used with autofocus SLR cameras with internal focusing lenses only.
Note: Use this ring with the following housing: