The olympus ptmc 01 macro converter for pt series 67mm has been specially made for the olympus underwater cases that feature a screw thread of 67mm if you are using the olympus pt ep01 waterproof case with the olympus 14 42mm f35 56 lens simply mount the olympus pmla ep01 macro lens adapter to the olympus pt ep01 case and you can add on the olympus ptmc 01 macro lens for striking macro underwater photography with a magnification up to x2