Ikelite FL Port Extension for Maximum 4.25" Lenses

A popular Modular Lens Extension for use with many longer length zoom lenses. The extension threads onto the base of either the Modular 8-inch Dome or the Modular Glass Flat Front for simple assembly and use in a wide variety of applications.Accommodates lenses up to 4.25-inch (10.8 cm) long and 3.3-inch (8.4 cm) in diameter when used with the Modular 8-inch Dome. Accommodates lenses up to 4.15-inch (10.5 cm) long when used with the Modular Glass Flat Front.