The WACP-1B is a 0.36x Wide Angle Conversion Port. Unlike traditional ports or wet-mate corrective wide-angle optics, the WACP-1B is a "dry" corrective optic that modifies a 28mm equivalent lens to an extremely sharp 130�.  Not only is the newer WACP-1B smaller and lighter, but it now integrates a built in buoyancy collar and offers a user interchangeable port mount from N120 to N100.