Ø30 mm Lens Tubes


30 mm Lens Tubes

  • Directly Accepts Ø30 mm Optics
  • Compatible with All SM30-Threaded Components
  • Stackable Design Enables Construction of Multi-Element Optical Systems


  • Easily Construct Multi-Element Optical Systems
  • Mount Several Optics within the Same Tube Using Multiple Retaining Rings
  • Adapters Provide Direct Compatibility with Our Ø1" or Ø2" Lens Tubes
  • Directly Accepts Ø30 mm Optics

Lens tubes are ideal for creating compact optical subassemblies. The Ø30 mm 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. These stackable lens tubes ship with one retaining ring. Additional retaining rings can be purchased separately. In addition to the Ø30 mm lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø1", Ø30 mm, Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter.

Adapters are also available on this page; these can be used to switch from the Ø30 mm standard to either our Ø1" or Ø2" standard. Via a two-step process, it is also possible to switch to our Ø1/2" or Ø3" standards.

Thorlabs' lens tubes utilize a series of non-standard threadings. If you wish to machine your own mating components, threading specifications for our lens tube and cage system components can be found on the Threading Specs tab.



Ø30 mm Lens Tubes

* Stackable Design Enables Construction of Multi-Element Optical Systems
* SM30-Threaded (M30.5-0.5) Bore Directly Accepts Ø30 mm Optics
* Compatible with All SM30-Threaded Components

These stackable Ø30 mm lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM30-threaded (M30.5-0.5) components provide flexibility for complex optomechanical assemblies. One SM30RR retaining ring is included with each lens tube.

Item #L1L2Thread Depth
SM30L05 0.65" 0.12" 0.5"
SM30L10 1.15" 0.12" 1.0"
SM30L30 3.15" 0.12" 3.0"


SM30 Adapters


Item #Typical ApplicationAdapter
External ThreadsInternal Threads
SM1A15   Step Up/Down Lens Tube Size SM30 (M30.5 x 0.5) SM1 (1.035"-40)
SM2A12   Step Up/Down Lens Tube Size SM30 (M30.5 x 0.5) SM2 (2.035"-40)
SM1A16   Step Up/Down Lens Tube Size SM1 (1.035"-40) SM30 (M30.5 x 0.5)
SM2A11   Step Up/Down Lens Tube Size SM2 (2.035"-40) SM30 (M30.5 x 0.5)


Retaining Rings/Spanner Wrenches


SM30RR: Retaining Rings
These retaining rings can be used to secure optics inside an SM30 Lens tube. One retaining ring is included in the lens tube; however, additional rings enable multiple optics to be secured inside the same lens tube.

SPW801: Adjustable Spanner Wrench

  • Ranges from Ø0.12" (Ø3 mm) to Ø3.0" (Ø75 mm)
  • One-Handed Operation Adjusts Spanning Range
  • Replacable Blades

The innovative design of the SPW801 Adjustable Spanner Wrench provides one-handed adjustment of the wrench blades, allowing for dynamic fine tuning of the blade separation to match spacing requirements exactly. The reversible blades contain an edge-offset fine point on one end and a flat blade on the opposing end (SPW102 replacement blades are available). This wrench is ideally suited for inserting the retaining rings into our Ø1/2", Ø1", Ø30 mm, Ø2", and Ø3" lens tubes. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch pounds.

SPW607: Hollow Spanner Wrench
The SPW607 Spanner Wrench is hollow enabling retaining rings for our SM30 lens tubes to be adjusted and installed without obscuring the beam path. The knurled grip on one end and the guide flanges on the other ensure safe adjustment of retaining rings without the risk of damage to optical elements.


Our Mission is to accelerate the advancement of optical technology for precision measurements and their applications from the table tops of research laboratories to standard use in communication and high technology industries. Our aim is to serve our customers. Our hope is to create a place for highly skilled people in an open environment

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