LBTEK lens sleeves are commonly used to secure optical components with a diameter of Ø76.2 mm or to block stray light in optical paths, preventing ambient light from affecting the system. LBTEK's SM3 lens sleeves are available with internal and external threads (SM3-xxA). Lens sleeve combinations can be connected to extend their length, facilitating the rapid assembly 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 SM3 lens sleeves, LBTEK also offers SM05, SM1, and SM2 lens sleeves, as well as compatible accessories such as lens sleeve adapters, retaining rings, and retaining ring wrenches.