Nauticam Compact Port Extension 50Crafted with the same high standards that Nauticam is known for, this port extension ensures consistent port to lens distance and alignment, helping you achieve sharper images and reliable focus performance across different lenses: Exact 50 mm Extension Length Provides precise optical spacing for select compact ports and lenses. High Quality Materials & Finish Built from durable, corrosion resistant materials engineered for rugged dive conditions.