Ikelite Standard Zoom Port Body for using Lenses up to 3.4" with the Flat Assembly or 3.5" with the 8" Dome Port. Modular Lens Extension for use with many shorter length zoom lenses Accommodates lenses up to 3.5-inch (8.9 cm) long and 3.3-inch (8.4 cm) in diameter when used with the Modular 8-inch Dome