Equinox 4" Flat Port for Underwater Housings

The Equinox 4" Flat Port for Underwater Housings is a clear optical glass lens port for underwater video housings for digital cameras. It fits onto the front of the Equinox HD6 / PRO6 or HD8 / PRO8 housings. You can simply replace your domeport with this flat port, which is recommended for macro lenses and those with longer focal lengths, whereas a dome port is preferable for lenses 28 mm and wider (35 mm film equivalent).