The LBTEK internal and external threaded lens tube features SM05 external threads on one end and SM05 internal threads on the other, primarily designed to secure optical components with a diameter of Ø12.7 mm. It allows for axial adjustment of the optical component's position through rotation along the optical axis. Once the desired position is achieved, it can be locked in place using an external retaining ring (SM05NR). Additionally, each lens tube comes with an SM05R retaining ring for securing the optical component. The SM05-8V model has both internal thread depth and external thread length of 12.5 mm, with a maximum installation thickness of 10.8 mm for Ø12.7 mm optical components. The adjustable range has a minimum value equal to the thickness of the external retaining ring, while the maximum value is the total length of the external threads minus the thickness of the external retaining ring and a minimum thread engagement depth of 2 mm.

The LBTEK internal and external threaded lens tube has SM1 external threads on one end and SM1 internal threads on the other, primarily used to secure optical components with a diameter of Ø25.4 mm. The position of the optical component can be adjusted along the optical axis by rotating it back and forth. Once the desired position is reached, it can be locked in place using an external retaining ring (SM1NR). Additionally, each lens tube comes with an SM1R retaining ring for securing the optical component. The internal thread depths for SM1-8V, SM1-20V, and SM1-33V are all 12.5 mm, while those for SM1-20VT and SM1-33VT are 16.5 mm. The external thread lengths are 12.5 mm, 25 mm, and 38 mm, respectively. The maximum installation thickness for Ø25.4 mm optical components is 10.5 mm and 14.5 mm. The minimum adjustable range equals the thickness of the external retaining ring, while the maximum adjustable range is the total length of the external thread minus the thickness of the external retaining ring and the minimum thread engagement depth of 2 mm.

The LBTEK internal and external threaded lens tube features SM2 external threads on one end and SM2 internal threads on the other, primarily used to secure optical components with a diameter of Ø50.8 mm. The position of the optical component can be adjusted along the optical axis by rotating it back and forth. Once the desired position is reached, it can be locked in place using an external retaining ring (SM2NR). Additionally, each lens tube comes with an SM2R retaining ring for securing the optical component. The SM2-20V internal thread has a depth of 12.5 mm, while the external thread length is 25 mm. The maximum installation thickness for Ø50.8 mm optical components is 10 mm. The adjustable range has a minimum value equal to the thickness of the external retaining ring, and a maximum value equal to the total length of the external thread minus the thickness of the external retaining ring and the minimum thread engagement depth of 2 mm.

The LBTEK SM1 Adjustable Shielded Lens Tube features SM1 external threads on both ends, allowing direct connection to SM1 internal threaded mechanical components. This shield tube provides an enclosed light-blocking space to achieve a sealed optical path environment. After one end of the adjustable shield lens tube is fixed, the other end can be rotated and extended. The shortest lengths of this series of shield tubes are 14 mm, 31 mm, and 60 mm, with adjustable ranges of 9 mm, 19 mm, and 49 mm respectively.