Our adjustable lens tubes provide precise control over the distance between optics in optical setups. Available in three diameters—Ø1/2", Ø1", and Ø2"—these tubes feature both internal and external threads. Each size includes 12.7 mm length of internal threading, while the external threading ranges from 12.7 mm to 38.1 mm in length. A retaining ring allows secure positioning of optics inside the tube, while a knurled locking ring enables easy adjustment of the optical spacing. These lens tubes combine flexibility and precision for dynamic optical systems.