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Ø1/2" Lens Tubes![]()
SM05L30C Slotted Lens Tube SM05M10 Lens Tube Without External Threads SM05L03 Lens Tube with Internal and External Threads SM05RR Retaining Ring SPW603 Spanner Wrench SM05 SM1 SM2 SM3 Easily Interfaces with Other Lens SM05L03V Lens Tube with Internal and External Threads Related Items ![]() Please Wait
![]() Click to Enlarge When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible. Features
Lens tubes are ideal for creating compact optical subassemblies. The Ø1/2" lens tubes sold here can be used to house one or several optical elements, as shown in the diagram of a beam expander below. Optics are separated and secured by retaining rings that are positioned at the desired depth within the lens tube using our SPW603 or SPW603L spanner wrenches. Depending on the item purchased, one or two retaining rings are included (see below for details). Additional retaining rings can be purchased separately. In addition to the Ø1/2" lens tubes featured on this page, Thorlabs also offers Ø1", Ø30 mm, Ø1.5", Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter. Vacuum-compatible versions of our Ø1/2" and Ø1" stackable lens tubes are available from stock; customers can request vacuum-compatible lens tubes at other lengths and diameters by contacting Tech Support. ![]() Thorlabs' Threading SpecificationsThorlabs' 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.
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These stackable Ø1/2" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM05-threaded (0.535"-40) components provide flexibility for complex optomechanical assemblies. One SM05RR Retaining Ring is included with each lens tube. ![]()
![]() ![]() Click to Enlarge Vents along the threading and at the ends of these tubes provide a free path for air to escape when under vacuum.
These stackable Ø1/2" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM05-threaded (0.535"-40) components provide flexibility for complex optomechanical assemblies. Made from 6061-T6 aluminum, these lens tubes are vacuum compatible down to 10-6 Torr. One vacuum-compatible SM05-threaded retaining ring is included with each lens tube. Please contact Tech Support for replacements. These vacuum-compatible lens tubes feature venting channels along the internal threading and at the ends of each tube. These channels allow air trapped between mounted optics an easy means of escape during pumpdown. ![]()
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Unlike our Ø1/2" stackable lens tubes featured above, these internally threaded lens tubes do not feature a lip at one end nor do they have external SM05 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use an SM05T2 Lens Tube Coupler. Two SM05RR Retaining Rings are included with each lens tube.
![]() ![]() Click to Enlarge The dust cover can be opened or closed by rotating it in either direction.
These stackable Ø1/2" lens tubes with side slots provide a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Optics can be inserted into the tube and locked into position using the included SM05RR retaining rings. Simply thread the first retaining ring to the desired depth, add the optic, and then use a second retaining ring to secure the optic. Optics can be manually adjusted via the side slots without the use of a spanner wrench. The rotatable slip shield included with the lens tube has an inner diameter of 0.71" (17.9 mm) and fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris.
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The SM05RR is our standard anodized aluminum retaining ring that ships with our Ø1/2" lens tubes as well as many other Thorlabs components and is available individually and in packs of 10. We offer six different SM05-threaded (0.535"-40) retaining rings, shown in the table to the right, which have unique features and can replace an SM05RR retaining ring. Please keep in mind that due to the increased thickness of some retaining rings, the maximum optic thickness that can be housed inside our standard SM05-compatible mounts will be diminished in some cases. Spanner Wrenches
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