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Products HomeØ2" Lens Tubes
- Directly Accepts Ø2" (50.8 mm) Optics
- Compatible with SM2-Threaded Components
- Designed for use with Our 60 mm Cage Systems
SM2L30C
SM2L30
SM2M10
SPW604
Spanner Wrench
SM05L10
SM1L10
SM2L10
SM3L10
SM1A1
SM1A2
SM3A2
Easily Interface with Other Lens Tube Sizes
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| Ø2" Shortcuts |
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| Lens Tube Couplers SM Thread Adapters Lens Tube Mounts End Caps Kinematic Mounts Fixed Lens Mounts Rotational Mounts Translation Mounts |
Features
- Easily Construct Multi-Element Optical Systems
- Wide Range of SM2 (2.035"-40) Compatible Optomechanical Components Available
- Compatible with Our 60 mm Cage Systems
- Directly Accepts Ø2" (50.8 mm) Optics
Lens tubes are ideal for creating compact optical subassemblies. The Ø2" 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 SPW604 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 Ø2" lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø1", Ø30 mm, and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter.
Click to Enlarge
When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
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.
| SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 0.535"-40.0, UNS-2A | Internal Thread, 0.535"-40.0, UNS-2B | ||
| Max Major Diameter | 0.5340" | Min Major Diameter | 0.5350" |
| Min Major Diameter | 0.5289" | Min Pitch Diameter | 0.5188" |
| Max Pitch Diameter | 0.5178" | Max Pitch Diameter | 0.5230" |
| Min Pitch Diameter | 0.5146" | Min Minor Diameter (and 83.3% of thread) | 0.508" |
| Max Minor Diameter | 0.5069" | Max Minor Diameter (and 64.9% of thread) | 0.514" |
| RMS Threading: Objective, Scan, and Tube Lenses | |||
|---|---|---|---|
| External Thread, 0.800"-36.0, UNS-2A | Internal Thread, 0.800"-36.0, UNS-2B | ||
| Max Major Diameter | 0.7989" | Min Major Diameter | 0.8000" |
| Min Major Diameter | 0.7934" | Min Pitch Diameter | 0.7820" |
| Max Pitch Diameter | 0.7809" | Max Pitch Diameter | 0.7866" |
| Min Pitch Diameter | 0.7774" | Min Minor Diameter (and 83.3% of thread) | 0.770" |
| Max Minor Diameter | 0.7688" | Max Minor Diameter (and 64.9% of thread) | 0.777" |
| C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras | |||
|---|---|---|---|
| External Thread, 1.000"-32.0, UN-2A | Internal Thread, 1.000"-32.0, UN-2B | ||
| Max Major Diameter | 0.9989" | Min Major Diameter | 1.0000" |
| Min Major Diameter | 0.9929" | Min Pitch Diameter | 0.9797" |
| Max Pitch Diameter | 0.9786" | Max Pitch Diameter | 0.9846" |
| Min Pitch Diameter | 0.9748" | Min Minor Diameter (and 83.3% of thread) | 0.966" |
| Max Minor Diameter | 0.9651" | Max Minor Diameter (and 64.9% of thread) | 0.974" |
| SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 1.035"-40.0, UNS-2A | Internal Thread, 1.035"-40.0, UNS-2B | ||
| Max Major Diameter | 1.0339" | Min Major Diameter | 1.0350" |
| Min Major Diameter | 1.0288" | Min Pitch Diameter | 1.0188" |
| Max Pitch Diameter | 1.0177" | Max Pitch Diameter | 1.0234" |
| Min Pitch Diameter | 1.0142" | Min Minor Diameter (and 83.3% of thread) | 1.008" |
| Max Minor Diameter | 1.0068" | Max Minor Diameter (and 64.9% of thread) | 1.014" |
| SM30 Threading: Ø30 mm Lens Tubes | |||
|---|---|---|---|
| External Thread, M30.5x0.5 | Internal Thread, M30.5x0.5 | ||
| Max Major Diameter | 30.480 mm | Min Major Diameter | 30.500 mm |
| Min Major Diameter | 30.371 mm | Min Pitch Diameter | 30.175 mm |
| Max Pitch Diameter | 30.155 mm | Max Pitch Diameter | 30.302 mm |
| Min Pitch Diameter | 30.059 mm | Min Minor Diameter (and 83.3% of thread) | 29.959 mm |
| Max Minor Diameter | 29.938 mm | Max Minor Diameter (and 64.9% of thread) | 30.094 mm |
| SM1.5 Threading: Ø1.5" Lens Tubes | |||
|---|---|---|---|
| External Thread, 1.535"-40, UNS-2A | Internal Thread, 1.535"-40, UNS-2B | ||
| Max Major Diameter | 1.5339" | Min Major Diameter | 1.535" |
| Min Major Diameter | 1.5288" | Min Pitch Diameter | 1.5188" |
| Max Pitch Diameter | 1.5177" | Max Pitch Diameter | 1.5236" |
| Min Pitch Diameter | 1.5140" | Min Minor Diameter (and 83.3% of thread) | 1.508" |
| Max Minor Diameter | 1.5068" | Max Minor Diameter (and 64.9% of thread) | 1.514" |
| SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 2.035"-40.0, UNS-2A | Internal Thread, 2.035"-40.0, UNS-2B | ||
| Max Major Diameter | 2.0338" | Min Major Diameter | 2.0350" |
| Min Major Diameter | 2.0287" | Min Pitch Diameter | 2.0188" |
| Max Pitch Diameter | 2.0176" | Max Pitch Diameter | 2.0239" |
| Min Pitch Diameter | 2.0137" | Min Minor Diameter (and 83.3% of thread) | 2.008" |
| Max Minor Diameter | 2.0067" | Max Minor Diameter (and 64.9% of thread) | 2.014" |
| SM3 Threading: Ø3" Lens Tubes | |||
|---|---|---|---|
| External Thread, 3.035"-40.0, UNS-2A | Internal Thread, 3.035"-40.0, UNS-2B | ||
| Max Major Diameter | 3.0337" | Min Major Diameter | 3.0350" |
| Min Major Diameter | 3.0286" | Min Pitch Diameter | 3.0188" |
| Max Pitch Diameter | 3.0175" | Max Pitch Diameter | 3.0242" |
| Min Pitch Diameter | 3.0133" | Min Minor Diameter (and 83.3% of thread) | 3.008" |
| Max Minor Diameter | 3.0066" | Max Minor Diameter (and 64.9% of thread) | 3.014" |
| Posted Comments: | |
Max D
(posted 2019-06-04 05:17:05.527) Hi Thorlabs team,
I would like to know what is the tolerance on tilt of a flat surface within your SM2M10 tube by using SM2 retainer ring.
Regards. llamb
(posted 2019-06-05 08:32:19.0) Hello, thank you for contacting Thorlabs. The exact tip/tilt of an optic will greatly depend on the optic's flatness/parallelism as well as the lens tube. I have reached out to you directly to discuss this lens tube's tolerances and your application's needs further. ger.folkersma
(posted 2016-06-30 04:53:01.43) Hi, the Solidowrks model of the SM2L15 seems to be corrupted. All other tube models work fine. s.kovalev
(posted 2015-10-13 20:29:52.873) Hello. Do you have 2'' tubes with 6'' length or can you make it for us. Thanks Sergey. besembeson
(posted 2015-10-13 03:57:52.0) Response from Bweh at Thorlabs USA: Yes we do. It seems the SM2E60 may be suitable for you - http://www.thorlabs.com/thorproduct.cfm?partnumber=SM2E60 cqtttv
(posted 2013-07-22 17:48:37.463) What is the tolerance on the diameter and sphericity? jlow
(posted 2013-07-22 15:58:00.0) Response from Jeremy at Thorlabs: I will contact you directly to discuss about your application and provide this information. |
Zoom- SM2-Threaded (2.035"-40) Bore Accepts Ø2" (Ø50.8 mm) Optics
- Stackable Design Enables Multi-Element Optical Systems
- Compatible with Our 60 mm Cage Assembly Systems
These stackable Ø2" Lens Tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with all SM2-threaded (2.035"-40) components provide flexibility for complex optomechanical assemblies. One SM2RR Retaining Ring is included with each lens tube.
| Item # | L1 | L2 | Thread Depth |
|---|---|---|---|
| SM2L03 | 0.45" (11.4 mm) | 0.12" (3.0 mm) |
0.30" (7.6 mm) |
| SM2L05 | 0.65" (16.5 mm) | 0.50" (12.7 mm) | |
| SM2L10 | 1.15" (29.2 mm) | 1.00" (25.4 mm) | |
| SM2L15 | 1.65" (41.9 mm) | 1.50" (38.1 mm) | |
| SM2L20 | 2.15" (54.6 mm) | 2.00" (50.8 mm) | |
| SM2L30 | 3.15" (80.0 mm) | 3.00" (76.2 mm) |
Zoom- SM2-Threaded (2.035"-40) Bore Accepts Ø2" (Ø50.8 mm) Optics
- Unlike Stackable Lens Tubes, Optics can be Accessed from Both Ends
- Use Lens Tube Couplers to Stack Multiple Lens Tubes
- Allows Coupling of Two Components with External SM2 Threading
- Directly Compatible with Our 60 mm Cage Assembly Systems
Unlike our Ø2" stackable lens tubes featured above, these Internally Threaded Lens Tubes do not feature a lip at one end nor do they have external SM2 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use an SM2T2 Lens Tube Coupler. Two SM2RR Retaining Rings are included with each lens tube.
Zoom- Easy Access to Optics
- Rotatable Slip Shield Protects Optics
- Compatible with SM2-Threaded Components
These stackable Ø2" Lens Tubes with side slots provide 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 SM2RR 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.
ZoomThe SM2E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. Although the ends of these extension tubes are threaded to accept our SM2 series stackable lens tubes, they feature thicker walls than our standard lens tubes, which leads to greater rigidity.
| Alternatives | Ø1" Lens Tube Extensions | ||
|---|---|---|---|
Zoom| Retaining Ring Specs | |||
|---|---|---|---|
| Item # | Feature | Thickness | Inner Diameter |
| SM2RR | Aluminum | 0.10" (2.5 mm) |
1.90" (48.3 mm) |
| SM2LTRR | Aluminum with Rubber O-Ring for Stress-Free Mounting |
0.18" (4.5 mm) |
1.68" (42.7 mm) |
| SM2RRC | Aluminum, 5 mm Thick for High-Curvature Lenses |
0.20" (5.0 mm) |
1.90" (48.3 mm) |
| POLARIS-SM2RR | Stainless Steel | 0.10" (2.5 mm) |
1.90" (48.3 mm) |
- Four Types of Retaining Rings for Securing Ø2" Optics
- Spanner Wrenches Provide One-Handed Adjustment of Retaining Rings
- SPW801 Adjustable Spanner Wrench can Accommodate Diameters from 0.12" (3.0 mm) to 2.89" (73.4 mm)
Thorlabs offers four different kinds of SM2 (2.035"-40) retaining rings. The SM2RR is our standard aluminum retaining ring that ships with our Ø2" lens tubes as well as many other Thorlabs components, and is available individually and in packs of 5.
Additionally, SM2RR Retaining Rings can be swapped out for one of the SM2-threaded retaining rings listed in the table to the right. 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 SM2-compatible mounts will be diminished in some cases.
There are also two spanner wrench choices that can be used with these retaining rings. The SPW604 Spanner Wrench has a hollow design that enables retaining rings for our SM2 series of lens tubes to be adjusted and installed without obscuring the beam path. The handle is knurled for improved grip. Alternatively, the SPW801 Adjustable Spanner Wrench can also be used to position SM2RR or SM2LTRR retaining rings. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch pounds. We also offer the SPB2 Spanner Bit, which can be used with a standard 1/4" hex driver (sold separately). The SPB2 is included as part of the SPB600 Spanner Wrench Bit Kit.
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