Adjustable Lens Tube SM2-20V

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.