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C-Mount Extension Tube and Spacer Ring Kits


  • Increase the Magnification of C-Mount and CS-Mount (1.00"-32) Camera Lenses
  • 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

CMSP-KIT

CML-KIT

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Ray Diagram Demonstrating the effect of a C-Mount Extension Tube
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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 and CS-Mount (1.00"-32) Camera Lenses
  • 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
  • Extension Tubes and Spacers Compatible with C-Mount Lenses and Cameras
  • Extension Tubes Compatible with Clamps and Slip Rings for Ø1" Lens Tubes

The C-Mount extension tubes and spacer rings included in these kits are designed to be used as spacers with C-Mount instruments such as Thorlabs' CCD/CMOS cameras and camera lenses. The use of these extension tubes and spacers increases 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.

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. Our CML-KIT includes extension tubes ranging in length from 5 mm to 100 mm for coarse adjustments of an optical system's length. Our CMSP-KIT includes brass spacer rings ranging in thickness from 0.25 mm to 2.00 mm that fit over external C-Mount threads. These rings fit between two C-Mount componenets and provide fine spacing adjustments. In addition, both kits contain a CS- to C-Mount extension adapter for compatibility with both types of cameras and lenses.

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" (Ø24.5 mm) or Ø25 mm (Ø0.98") optics. However, 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 Ø1/2", Ø1", Ø30 mm, Ø2", and Ø3" lens tubes, each of which is equipped with an SM thread standard that depends on the tube diameter.

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
Refills Available
C-Mount Compatible Products
CCD/CMOS Cameras Camera Lenses Zoom Lenses Thread Adapters Terminated Fiber Adapters

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 LensesCCD/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"

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.

14" (356 mm) Object Distance
No Spacer

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4" (102 mm) Object Distance
No Spacer

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4" (102 mm) Object Distance
5 mm Spacer

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Click Here for Raw (2048 x 2048) Image
5/8" (16 mm) Object Distance
20 mm (15 mm + 5 mm) Spacer

Click to Enlarge
Click Here for Raw (2048 x 2048) Image

RSP1X15 rotation mount imaged using a 4070M-GE Scientific Camera 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

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CML-KIT Support Documentation
CML-KITC-Mount Extension Tube Kit: 5 mm - 100 mm
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CMSP-KIT Support Documentation
CMSP-KITC-Mount Brass Spacer Ring Kit: 0.25 mm - 5 mm
$104.97
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