The Ocean Studio
INON Close Up UCL-165M67 Close Up Lens
Inon Close-Up Lenses can be attached directly to an existing 67 mm screw thread mount on your underwater housing. It will give you up to 165 mm of focal length to your subject, ideal to capture smaller, shyer subjects with incredible detail.
It can be used with the camera's zoom or microscope mode to achieve even more powerful close-up images. They can also be stacked.