One of the unique advantages of a mirrorless system is that almost lens can be used via an adapter. One of the options this makes possible is a patent pending adapter for the heralded Nikonos U/W Nikkor water contact range finder lenses. While the Sony E- mount lenses offer excellent optics and autofocus performance, the Nikonos lenses yield incredibly sharp images. The unique adapter allows the Nikonos lenses to easily be removed and replaced with Sony E- Mount lenses and Nauticam ports.