underwater photography dome glass port is best used with Olympus 8mm 1.8 m4/3 lens or the Panasonic 8mm 3.5 fisheye lens. This dome also works with the Olympus 12mm f2.0 lens

Port extensions or adapters may be necessary for some ports and housings. This optical-glass fisheye port has a glass diameter of 140mm and is part of the N85 mm port system. 36048 

Use with Olympus EM - Panasonic GH - Black Magic 4k pocket and possibly other micro 4/3 sensor cameras. Only One at this price. Never used glass dome by Nauticam .