The LBTEK SM1.5 lens tube is commonly used to secure optical components with a diameter of Ø38.1 mm or to block stray light in optical paths to prevent environmental light from affecting the system. LBTEK's SM1.5 lens tubes feature both internal and external SM1.5 threads. The combination of lens tubes allows for length extension, facilitating the rapid setup of compact optical systems. By using a retaining ring wrench, the retaining ring can be positioned at the desired location inside the lens tube to separate and secure optical components. In addition to the standard SM1.5 lens tubes, LBTEK also offers SM05, SM1, and SM2 lens tubes, along with compatible accessories such as lens tube adapters, retaining rings, and retaining ring wrenches.