Ikelite 5510.24 FL Port Extension for Lenses Up To 4.25 Inches
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.
In the Box: Extension, O-ring to housing # 0105, O-ring to front # 0132.41, Silicone lubricant 1cc tube