Ewa Marine 58mm Ring Set with Lens Port Adapter
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The EM C-A58 Ewa-Marine 58mm adapter ring set is for use in centering your camera lens being used in a Ewa-Marine housing. This set consist of a "screw on to the lens" ring.
The second half is an outer ring that pressure fits into the inside of the housing port. This ring is for use with autofocus SLR cameras that have internal focusing type lenses only.