The AOI underwater ports for the Olympus PEN series housings allow you to expand your system with the addition of new lenses. The FLP-04 flat lens port is designed for the Olympus 14-42mm EZ Lens and allows you to get up close with a macro lens and wide shots with a wide lens. With a 67mm threaded front, you can thread on M67 external close up and wide-angle lenses.