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Ø1.5" Lens Tubes
0.3" Thread Depth
0.5" Thread Depth
1.00" Thread Depth
2.00" Thread Depth
SM1.5 (1.535"-40) Retaining Ring
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When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
Lens tubes are ideal for creating compact optical subassemblies with light-tight beam paths. The Ø1.5" lens tubes sold here can be used to house one or several optical elements. Optics are separated and secured by retaining rings that are positioned at the desired depth within the lens tube using a spanner wrench. Each stackable lens tube ships with one retaining ring. Additional retaining rings can be purchased separately. In addition to the Ø1.5" lens tubes featured on this page, Thorlabs also offers versions from Ø1/2" to Ø3", each of which is equipped with an SM-series thread standard that depends on the tube diameter. Additional lens tube sizes can be found in the table to the right.
Thorlabs' Threading Specifications
Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
These stackable Ø1.5" lens tubes provide a fast and easy means for building compact optical assemblies. They can directly interface with any SM1.5-threaded (1.535"-40) component to provide flexibility for complex optomechanical systems. One SM1.5RR Retaining Ring is included with each lens tube.
These Retaining Rings can be used to secure optical components into our SM1.5-threaded (1.535"-40) lens tubes. One retaining ring is included with in the purchase of a lens tube; however, additional rings enable multiple optics to be secured inside the same lens tube. The SPW801 Adjustable Spanner Wrench can be used to position SM1.5RR retaining rings. Please note that the SPW801 wrench can withstand a maximum torque of 80 lb-in.