AquaTech PD-16" Dome Lens Port

The PD-16" Dome Lens Port from AquaTech allows you to capture over/under images with a wide variety of lenses and focal lengths. From fisheye to 50mm lenses, it's just about possible to fit any wide-angle lens in the PD-16". Over/under images combine the scene above the water level with the view below the water's surface to create an image that shows both.

Why 16"? There are two main reasons large dome ports are used for creating over/under images: magnification and dome radius. The curved surface of a dome port counteracts the magnification effect that happens to light when it passes through water. When viewed through a flat surface (like your snorkel mask or a fish tank), subjects underwater will appear bigger than they actually are. This is not a problem when your entire composition is underwater, but when you want to view a subject above and below the surface, this becomes an issue. The large radius of a 16" dome also adds more distance between the camera lens and the water surface. This distance allows the lens to easily see above and below the water plane and also provides a smaller water line in your image, allowing for a less distracting and more visually pleasing image.