A popular Modular Lens Extension for use with many shorter 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 3.5-inch (8.9 cm) long and 3.3-inch (8.4 cm) in diameter when used with the Modular 8-inch Dome. Accommodates lenses up to 3.4-inch (8.6 cm) long when used with the Modular Glass Flat Front. Measure your lens or use our Port Finder to determine compatibility.