The Olympus XZ-2 is a great little camera, that DOES produce excellent results underwater.
For macro stuff (and now you have a strobe - which one?) set the camera to Shutter Priority and set to 1/200th and iso400. Mount the strobe directly above the lens and pointing slightly up (so not full power directly on the subject).
You need to click up the flash before inserting it in to the housing, as it can't be done once in the housing.
Confirm the strobe is connected via an optical cable, in TTL mode and the camera is set to Flash 'Fill-In' mode.
You will be pleased with the results - for sure!
For macro stuff (and now you have a strobe - which one?) set the camera to Shutter Priority and set to 1/200th and iso400. Mount the strobe directly above the lens and pointing slightly up (so not full power directly on the subject).
You need to click up the flash before inserting it in to the housing, as it can't be done once in the housing.
Confirm the strobe is connected via an optical cable, in TTL mode and the camera is set to Flash 'Fill-In' mode.
You will be pleased with the results - for sure!