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Ø1/2" Lens Tubes
Easily Interfaces with Other Lens
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 spanner wrench. Depending on the item purchased, one or two retaining rings will be 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, Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter.
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 Ø1/2" 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.
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.
This stackable Ø1/2" lens tube with side slots provides a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Several optics can be inserted into a single tube using multiple 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 fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris. Two retaining rings and one black plastic dust cover are included with each lens tube.
Thorlabs offers two different kinds of SM05 (0.535"-40) Retaining Rings. The SM05RR is our Standard 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. If desirable, the SM05RR can be swapped out for a SM05LTRR, which is a Retaining Ring equipped with a Buna-N O-ring designed to reduce stress on the optical component and to produce a light-tight seal.
To position and adjust these retaining rings, choose one of our two spanner wrench options. The SPW603 Spanner Wrench has a hollow design that enables retaining rings for our SM05 series of lens tubes to be adjusted and installed without obscuring the beam path. The handle is knurled for improved grip. For use with longer lens tubes, multiple SPW603 spanning wrenches can be stacked to extend the wrench's maximum reach. Alternatively, the SPW801 Adjustable Spanner Wrench can also be used to position SM05RR or SM05LTRR retaining rings. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch pounds. As an additional option, we also offer the SPB600 Spanner Wrench Bit Kit.