Ø3" Lens Tubes
Features- Easily Construct Multi-Element Optical Systems
- Designed for Compatibility with Ø3" (Ø75 mm) Optics
- Wide Range of SM3-Compatible Optomechanical Components Available
Lens tubes are ideal for creating compact optical subassemblies. The Ø3" 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 Ø3" 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. For fine tuning of the first or last lens in a lens tube system, consider using a SM3V10 Adjustable Length Lens Tube.
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SM Series 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. For threading specifications other than what is listed here, please contact Tech Support. | SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems |
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| 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" |
| SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems |
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| 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 |
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| 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 |
| SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems |
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| 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 |
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| 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" |
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Ø3" Lens Tubes
