LBTEK lens sleeves are commonly used to secure optical components with a diameter of Ø30 mm or to block stray light in optical paths, preventing environmental light from affecting the system. LBTEK's SM30 lens sleeves are available in one version with internal and external threads (SM30-xxA). Lens sleeve combinations can be connected to extend the length, facilitating the rapid construction of compact optical systems. By using a retaining ring wrench, the retaining ring can be positioned at the desired location inside the lens sleeve to separate and secure optical components. In addition to the standard SM30 lens sleeves, LBTEK also offers lens sleeves in SM05, SM1, and SM2 sizes, as well as compatible accessories such as lens sleeve adapters, retaining rings, and retaining ring wrenches.