Ikelite DLM Mirrorless 1.2-inch Lens ExtensionIkelite DLM Mirrorless 1. 2 inch Lens Extension IK551665 Ikelite Product Number 5516. 65 Product Description Extends a Mirrorless Lens Port by 1. 2 inches (30mm) for use with longer lenses. Mirrorless Port System An interchangeable lens camera demands a housing with interchangeable lens ports. It couldn't be more simple to change ports than this systemjust press the port on and tighten three thumb screws. Feel positive reinforcement that the port is