The Nauticam does not give u full control of the aperture , ISO and shutter speed.
The sea and sea and recsea Alu housing allow full control of all 3 settings.
As long as u have the button at the back and able to turn the front dial. Then u can the most control 2 of the 3 settings.
i would like to say.. i am wrong.. the nauticam does have a control ring at the back.. therefore.. it is able to have full control ont he RX100