Century Optics 90mm Slip-on Adapter Ring for Super Fisheye Adaptor MK II (0WA-FESU-RD)
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This adapter allows you to attach the Century Super Wide Angle Adapter # 0WA-5X45-00 to a lens with an 90m front diameter. The 0FA-5X90-00 screws into the thread of the attachment, and then slips onto the camera lens. It is secured by a single stainless steel lock screw.