SEA&SEA MDX mount offers a broad range of ports in order to accommodate the various lenses available.
Macro (close-up range), Zoom (adjustable range), and Wide-Angle (fixed wide range) lenses require differing ports and accessories. The focus ranges (Macro, Zoom, Wide-Angle) you select will require specific ports to fit on your housing. Certain ports may be compatible with more than one lens.
Please note that use of the wrong port or wrong combination of ports for a lens may cause vignetting and/or damage to the lens or port(s).