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Products Home / Optomechanical Components / Lens Tube Systems / C-Mount Extension Tubes / C-Mount Extension Tubes and Spacer RingsC-Mount Extension Tubes and Spacer Rings
CML05
CS- to C-Mount Adapter
CMRR
C-Mount Retaining Ring
- Extension Tubes and Spacer Rings for C-Mount (1.00"-32) Components
- Reduce the Object Distance of Camera Lenses
- Introduce Distances from 0.25 mm (0.01") to 100.0 mm (3.94")
Application Idea
CML25 Extension Tube Between a Machine Vision Lens and a 1501M-USB Scientific Camera
CMSP150
1.50 mm Spacer Ring
CMSP100 Spacer Ring Between CML100 and CML15 Extension Tubes
Please Wait
Click to Enlarge
The introduction of an extension tube or spacer ring between a camera and a lens decreases the object distance and increases the image distance.
Features
- Increase the Magnification of C-Mount (1.00"-32) Camera Lenses
- Extension Tubes and Spacers Compatible with C-Mount Lenses and Cameras
- Also Compatible with CS-Mount
- Also Available in Kits (See Below)
The C-Mount extension tubes and spacer rings sold here are designed to be used as spacers with C-Mount and CS-Mount instruments such as Thorlabs' CCD/CMOS cameras and camera lenses. These extension tubes or spacers increase the image distance between the lens and the camera sensor. This allows the lens to focus on objects at shorter distances than would be possible without a spacer. The decreased object distance increases the magnification of the image on the camera sensor while decreasing the depth of field.
We offer C-Mount extension tubes in lengths from 5 mm to 100 mm for coarse adjustments of an optical system's length. We also offer adjustable extension tubes for continuous adjustment up to 0.81" (20.6 mm). In addition, brass spacer rings that fit over external C-Mount threads are available in thicknesses from 0.25 mm (0.01") to 2.00 mm (0.08"). These rings fit between two C-Mount components and provide fine spacing adjustments.
The 1.20" (30.5 mm) outer diameter of the C-Mount extension tubes is the same as that of Thorlabs' Ø1" lens tubes, so the C-Mount tubes are compatible with all clamps and slip rings for Ø1" lens tubes. However, the 0.97" (24.6 mm) inner diameter of the C-Mount tubes is too small to accept Ø1" (Ø25.4 mm) or Ø25 mm (Ø0.98") optics. Non-standard optics with diameters between 0.87" (22.0 mm) and 0.97" (24.6 mm) can be secured inside the tubes with C-Mount retaining rings. For the construction of optical systems, Thorlabs offers lens tubes that accept Ø1/2", Ø1", Ø30 mm, Ø2", or Ø3" optics, each of which is equipped with an SM thread standard that depends on the tube diameter.
We also offer extension tube and spacer ring kits, which contain a variety of thicknesses/lengths to allow for fine/coarse adjustment of the image distance without having to search for a single piece to provide the right distance.
When used to image objects within the range of specified object distances, Thorlabs' camera lenses are designed to correct for optical aberrations. The modification of the specified object distance with extension tubes and spacer rings may reduce the ability of these lenses to eliminate aberrations. Please refer to the Object Distances tab for more details.
| C-Mount Compatible Products | |||||
|---|---|---|---|---|---|
| CCD/CMOS Cameras | Camera Lenses | Zoom Lenses | Thread Adapters | Terminated Fiber Adapters | |
Thorlabs' Camera Lenses for Machine Vision each have a characteristic range of object distances. Objects placed within this range can be brought to a sharp focus on the sensor of the C-Mount camera. As seen in the image sequence below, the addition of an extension tube between the camera and the lens changes this range of object distances and allows the system to focus on objects closer to the lens. This increases the magnification of the image on the camera while decreasing the depth of field. The following table lists the range of possible object distances for various combinations of Thorlabs' C-Mount extension tubes and machine vision lenses.
Note that Thorlabs' camera lenses are designed to correct for optical aberrations witin a specified range of object distances. The modification of the specified minimum object distance with an extension tube may reduce the ability of these lenses to eliminate aberrations.
20 mm (15 mm + 5 mm) Spacer
Click to Enlarge
Click Here for Raw (2048 x 2048) Image
RSP1X15 rotation mount imaged using a previous-generation scientific camera (Item # 4070M-GE) and MVL25M43 Lens at different object distances. A 20 mm spacer was created by using CML05 and CML15 spacers together.
| Object Distance and Magnification for Lens and Spacer Combinations | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Camera Lens | Focal Length | Design Format | No Spacer | 1 mm Spacer | 5 mm Spacer | 10 mm Spacer | 20 mm Spacer | |||||
| Minimum Object Distance | Magnification | Minimum Object Distance | Magnification | Minimum Object Distance | Magnification | Minimum Object Distance | Magnification | Minimum Object Distance | Magnification | |||
| MVL8M23 | 8 mm | 2/3" | 120 mm | 0.07 | 30 mm | 0.2 | - | - | - | - | - | - |
| MVL12M23 | 12 mm | 2/3" | 150 mm | 0.08 | 70 mm | 0.16 | - | - | - | - | - | - |
| MVL12M1 | 12 mm | 1" | 300 mm | 0.04 | 93 mm | 0.12 | - | - | - | - | - | - |
| MVL12M43 | 12 mm | 4/3" | 100 mm | 0.1 | 48 mm | 0.19 | - | - | - | - | - | - |
| MVL16M23 | 16 mm | 2/3" | 200 mm | 0.08 | 110 mm | 0.14 | - | - | - | - | - | - |
| MVL16M1 | 16 mm | 1" | 300 mm | 0.05 | 134 mm | 0.11 | - | - | - | - | - | - |
| MVL25M23 | 25 mm | 2/3" | 200 mm | 0.12 | 150 mm | 0.16 | 73 mm | 0.31 | - | - | - | - |
| MVL25TM23 | 25 mm | 2/3" | 100 mm | 0.24 | 79 mm | 0.28 | 46 mm | 0.44 | 29 mm | 0.63 | - | - |
| MVL25M1 | 25 mm | 1" | 300 mm | 0.08 | 200 mm | 0.12 | 83 mm | 0.28 | - | - | - | - |
| MVL25M43 | 25 mm | 4/3" | 150 mm | 0.15 | 115 mm | 0.19 | 56 mm | 0.35 | 31 mm | 0.55 | 12 mm | 0.96 |
| MVL35M23 | 35 mm | 2/3" | 200 mm | 0.18 | 175 mm | 0.21 | 115 mm | 0.32 | 81 mm | 0.46 | 51 mm | 0.73 |
| MVL35M1 | 35 mm | 1" | 300 mm | 0.12 | 243 mm | 0.15 | 138 mm | 0.26 | 91 mm | 0.4 | - | - |
| MVL50M23 | 50 mm | 2/3" | 200 mm | 0.3 | 190 mm | 0.32 | 160 mm | 0.39 | 135 mm | 0.48 | 105 mm | 0.65 |
| MVL50TM23 | 50 mm | 2/3" | 100 mm | 0.46 | 91 mm | 0.48 | 76 mm | 0.58 | 64 mm | 0.7 | 49 mm | 0.94 |
| MVL50M1 | 50 mm | 1" | 500 mm | 0.11 | 424 mm | 0.13 | 269 mm | 0.2 | 189 mm | 0.3 | 124 mm | 0.5 |
| MVL75M1 | 75 mm | 1" | 1000 mm | 0.078 | 858 mm | 0.091 | 553 mm | 0.14 | 389 mm | 0.21 | 251 mm | 0.34 |
| MVL75M23 | 75 mm | 2/3" | 1200 mm | 0.07 | 1010 mm | 0.08 | 630 mm | 0.13 | 440 mm | 0.2 | 285 mm | 0.34 |
| MVL100M23 | 100 mm | 2/3" | 2000 mm | 0.05 | 1700 mm | 0.06 | 1060 mm | 0.1 | 740 mm | 0.15 | 480 mm | 0.25 |
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" |
| SM4 Threading: Ø4" Fixed Lens Mounts | |||
|---|---|---|---|
| External Thread, 4.035"-40.0, UNS-2A | Internal Thread, 4.035"-40.0, UNS-2B | ||
| Max Major Diameter | 4.0337" | Min Major Diameter | 4.0350" |
| Min Major Diameter | 4.0286" | Min Pitch Diameter | 4.0188" |
| Max Pitch Diameter | 4.0175" | Max Pitch Diameter | 4.0245" |
| Min Pitch Diameter | 4.0131" | Min Minor Diameter (and 83.3% of thread) | 4.008" |
| Max Minor Diameter | 4.0066" | Max Minor Diameter (and 64.9% of thread) | 4.014" |
| Posted Comments: | |
jdelorme
(posted 2016-12-16 02:48:58.713) There is a mistake in the table of the section : C-Mount Extension Tubes.
CML05 -- 5.0 mm (0.39") -- 4.2 mm (0.17")
-->
5.0 mm ≠ 0.39'' tfrisch
(posted 2016-12-16 10:40:30.0) Thank you for bringing this to our attention. |
Zoom
- Stackable Design
- Internally C-Mount Threaded (1.00"-32)
- Directly Compatible With Our Clamps and Slip Rings for Ø1" Lens Tubes
- Extension Tube Kit is Also Available (See Below)
These C-Mount extension tubes introduce a fixed spacing between C-Mount components, such as Thorlabs' CCD/CMOS cameras and camera lenses. They have a stackable design and C-Mount (1.00"-32) threads for direct compatibility with any C-Mount components. The CML05 CS-Mount to C-Mount Extension Adapter is sized to increase the flange-to-sensor distance of a CS-Mount camera by 5 mm (0.39") to match the C-Mount standard distance.
These extension tubes have a 0.97" (24.6 mm) inner diameter that is too small to accept Ø1" (Ø25.4 mm) or Ø25 mm (Ø0.98") optics. Optics with diameters between 0.87" (22.0 mm) and 0.97" (24.6 mm) can be secured inside these tubes with C-Mount retaining rings. These extension tubes do not include C-Mount retaining rings, which can be purchased below.
| Item # | L | Thread Depth |
|---|---|---|
| CML05 | 5.0 mm (0.20") | 4.2 mm (0.17") |
| CML10 | 10.0 mm (0.39") | 9.2 mm (0.36") |
| CML15 | 15.0 mm (0.59") | 14.2 mm (0.56") |
| CML25 | 25.0 mm (0.98") | 24.2 mm (0.95") |
| CML40 | 40.0 mm (1.58") | 39.2 mm (1.55") |
| CML50 | 50.0 mm (1.97") | 49.2 mm (1.94") |
| CML100 | 100.0 mm (3.94") | 99.2 mm (3.91") |
| Alternatives | Ø1/2", Ø1", Ø30 mm, Ø2", and Ø3" Stackable Lens Tubes for Optical System Construction |
|---|
Zoom
Click to Enlarge
CMSP100 Spacer Ring Between CML100 and CML15 Extension Tubes
- Introduce a Fixed Spacing Between Two C-Mount Components
- Fit Over External C-Mount (1.00"-32) Threads
- Brass Construction
- 0.25 mm (0.01") to 2.00 mm (0.08") Thickness
- Spacer Ring Kit is Also Available (See Below)
These C-Mount Spacer Rings fit between two C-Mount (1.00"-32) components, such as Thorlabs' C-Mount extension tubes, camera lenses, and CCD/CMOS cameras. Much like the extension tubes sold above, the rings add length to an optical system. As shown to the right, these spacer rings fit over external C-Mount threads and allow for much finer adjustments of the spacing between components. The rings must be introduced between two other C-Mount components. They are constructed from brass and laser engraved with a part number.
Zoom- Standard Retaining Ring with C-Mount (1.00"-32) Threads
- Compatible with CMR Lens Mount, C-Mount Extension Tubes, and C-Mount Cameras
Our C-Mount-threaded (1.00"-32) retaining ring is ideal for securing components into our C-Mount extension tubes, CMR lens mount, and C- or CS-Mount compatible CCD and CMOS cameras. As shown in the photo to the left, these retaining rings are engraved with both the part number and "C-Mount" to distinguish it from our SM-threaded retaining rings. Each retaining ring is machined with two slots for compatibility with our SPW801 adjustable spanner wrench, which is sold below. Note that Thorlabs' C-Mount extension tubes cannot accept Ø1" (25.4 mm) or Ø25 mm (0.98") optics.
Zoom- CMSP-KIT Contains Spacers with Thickness from 0.25 mm to 5 mm
- CML-KIT Contains Extension Tubes with Lengths from 5 mm to 100 mm
- Compatible with C-Mount and CS-Mount Lenses and Cameras
- Extension Tubes Compatible with Clamps and Slip Rings for Ø1" Lens Tubes
These kits contain a variety of thicknesses/lengths to allow for fine/coarse adjustment of the image distance without having to search for a single piece to provide the right distance. Both kits contain a CS- to C-Mount extension adapter to allow compatibility with both types of lenses and cameras. In addition, the CML-KIT comes with two CMRR C-Mount retaining rings.
| CMSP-KIT C-Mount Brass Spacer Kit | |
|---|---|
| Component Description (Item #) | Qty. |
| 0.25 mm Thick Spacer (CMSP025) | 2 |
| 0.50 mm Thick Spacer (CMSP050) | 2 |
| 1.00 mm Thick Spacer (CMSP100) | 2 |
| 1.25 mm Thick Spacer (CMSP125) | 2 |
| 1.50 mm Thick Spacer (CMSP150) | 2 |
| 2.00 mm Thick Spacer (CMSP200) | 2 |
| CS- to C-Mount Extension Adapter (CML05) | 1 |
| CML-KIT C-Mount Extension Tube Kit | |
|---|---|
| Component Description (Item #) | Qty. |
| CS- to C-Mount Extension Adapter (CML05) | 1 |
| 10 mm Long Extension Tube (CML10) | 1 |
| 15 mm Long Extension Tube (CML15) | 1 |
| 25 mm Long Extension Tube (CML25) | 1 |
| 40 mm Long Extension Tube (CML40) | 1 |
| 50 mm Long Extension Tube (CML50) | 1 |
| 100 mm Long Extension Tube (CML100) | 1 |
| C-Mount Retaining Ring (CMRR) | 2 |
Click to Enlarge
Contents of CML-KIT
Zoom- Diameter Range from 0.12" to 2.89" (3.0 mm to 73.4 mm)
- Self-Centering, One-Handed Diameter Adjustment Mechanism
- Replaceable Stainless Steel Blades
Thorlabs' Adjustable Spanner Wrench features a spanning range that is continuously adjustable from 0.12" to 2.89" (3.0 mm to 73.4 mm). It is capable of providing an exact fit for retaining rings as large as the SM3RR for Ø3" Lens Tubes and Mounts. The diameter spanned by the blades remains centered while the knurled knob is adjusted.
The reversible blades have a flat tip on one end intended for use with retaining rings, and an edge-offset fine point on the opposing end for adapters with holes. The blades extend 1.6" (40.7 mm) from the body of the wrench. Hence, compared to our cylindrical spanner wrenches sold above, the SPW801 is ideal for securing lenses with a high radius of curvature because the guide flanges on the cylindrical spanner wrenches may come into contact with the lens. To reverse the blades, a 0.050" (1.3 mm) balldriver or hex key is needed. Replacement blade pairs are available separately.
The SPW801 wrench withstands a maximum torque of 80 inch-pounds (9 N·m).
 C-Mount Extension Tubes |
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