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C-Mount Extension Tube Adapters and Accessories


  • Couple C-Mount Extension Tube Systems
  • Seal Light Path in Optical Systems

SC1L24

Slip-On Cover,
24" Long

SM1CPL

Flexure Sleeve Coupler,
3" Long

SM1B3

Bellows,
1.50" - 8.66" Long

CMCP2

C-Mount Cap

CMT10

C-Mount Coupler,
1" Long

Related Items


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Features

  • Couplers, Caps, and Covers for C-Mount Extension Tubes
  • Create Light-Tight Enclosures Between Extension Tubes

Thorlabs offers couplers, caps, and tube covers compatible with our C-Mount CCD/CMOS cameras, camera lenses, and extension tubes. These can be used to maintain a light-tight optical path in systems that use our C-Mount extension tubes.

The SC600 and SC1800RL Aluminum Lens Tube Covers can be easily cut to custom lengths using our SC1K Tool Kit, pictured below. This kit contains a tubing cutter and de-burring tool, jig, and pliers, allowing the user to cut the aluminum covers and then crimp the edges to form a light press fit. These lens tube covers, sold at the bottom of this page, can be cut to a desired length up to 1828.8 mm (for the unanodized aluminum version) or 609.6 mm (for the anodized aluminum version).

Note: Please read all instructions before beginning as some steps have information pertinent to the prior step.
SC1K Jig
Soft Jaw Pliers
Tubing Cutter

 

To Cut the Aluminum Cover Tubing: 


Click to Enlarge

Step 1: Rotate the knob on the tubing cutter counterclockwise to open the cutter far enough to insert the tubing between the rollers and the blade.

Click to Enlarge

Step 2: Slide the tubing into the tubing cutter between the rollers and the circular blade. Position the blade along the tubing such that a cut will produce the desired length of tubing.

Click to Enlarge

Step 3: Rotate the knob on the tubing cutter clockwise until it begins to lightly cut into the tubing. Although you want the blade to be in good contact with the tubing, do not overtighten the cutter, as that may cause tube cover deformation.

Click to Enlarge

Step 4: Slowly rotate the tubing cutter to score the tubing, rotating the tool, blade first. Take care that the cutter completes its rotation where it began, making a closed ring around the tubing rather than a spiral that will fail to cut the tubing. Continue to carefully rotate the cutter around the tube until the blade has cut all the way through the thickness of the tubing. With each rotation, tighten the knob on the top of the cutter so that the blade remains in good contact with the tubing but avoid over tightening. Note that the knob will only need to be tightened about a half of a turn from its initial scoring position to cut through the tubing.

Click to Enlarge

Step 5: After the tubing is cut through, pull the deburring tool out of the body of the tubing cutter to deburr the cut edges.

Click to Enlarge

Step 6: Lightly press the flat edge of the deburring tool against the inside of the cut edge of the tubing. Maintaining pressure, rotate the tool around the inner edge of the tubing to remove any rough spots created by the cutting process.

 

To Crimp the Ends of the Aluminum Cover Tubing: 


Click to Enlarge

Step 1: Insert the jig into the end of the tubing so that the engraving faces outward. The lip of the jig should be pushed up against the dust cover tubing.

Click to Enlarge

Step 2: Using the soft jaw pliers supplied in the kit, squeeze the dust cover so that the two sides of the tubing make contact with the jig. The force applied by the pliers should be over the jig to ensure that the tubing is not deformed.

Click to Enlarge

Step 3: The end of the lens tube cover tubing is now crimped and will have a light press fit with all Thorlabs SM1 series lens tubes.

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C-Mount Extension Tube Couplers

The CMT1 is an internally C-Mount-threaded coupler for joining two externally threaded C-Mount (1.00"-32) components. Its length of 0.35" is designed for direct mating of two C-Mount Extension Tubes.

The CMT2 and CMT10 externally threaded couplers are designed for joining internally C-Mount-threaded components. These feature external threads along the entire length of the part, allowing the relative position and rotation of a camera and lens to be adjusted. Each coupler ships with two CMNT Locking Rings, which can be tightened by hand to secure the attached components. Additional locking rings can be purchased separately to limit the external thread depth of any C-Mount-threaded components. The use of multiple locking rings allows lens tubes to be locked independently, such as when using crossed polarizers (see the video above).

For applications where it is difficult to reach the locking ring by hand, we offer the CMNT1 Slotted Locking Ring and SPW502 Spanner Wrench. This locking ring contains slots for the 1¼" end of the spanner wrench.

The table below gives the specifications for all available couplers and locking rings.

Item # CMT1 CMT2 CMT10 CMNT CMNT1
Description C-Mount Extension Tube Coupler C-Mount Locking Ring C-Mount Slotted Locking Ring
Threads Internal C-Mount External C-Mount Internal C-Mount
Length 0.35" (8.9 mm) 0.5" (12.7 mm) 1.0" (25.4 mm) 0.11" (2.8 mm)
Lens Tube
Separation Rangea
N/A 0.22" - 0.34" 
(5.6 mm - 8.6 mm)
0.22" - 0.84"
(5.6 mm - 21.3 mm)
N/A N/A
Drawing
  • The minimum is based on the sum of the thickness of two CMNT locking rings (or equivalently two CMNT1 locking rings), and the maximum is based on the length of the tube minus a 0.08" (2 mm) minimum thread depth for both attached components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CMT1 Support Documentation
CMT1C-Mount (1.00"-32) Coupler, Internal Threads
$10.60
Today
CMT2 Support Documentation
CMT2C-Mount (1.00"-32) Coupler, External Threads, 0.5" Long
$21.54
Today
CMT10 Support Documentation
CMT10C-Mount (1.00"-32) Coupler, External Threads, 1" Long
$22.07
Today
CMNT Support Documentation
CMNTC-Mount (1.00"-32) Locking Ring, 1.25" Outer Diameter
$7.06
Today
CMNT1 Support Documentation
CMNT1C-Mount (1.00"-32) Locking Ring, 1.25" Outer Diameter, Slots for Spanner Wrench
$11.03
Today

C-Mount Extension Tube Caps

Lens Tube Cap, End Cap
Click to Enlarge

Each Cap is Engraved with
Part Number
  • Internally or Externally C-Mount-Threaded (1.00"-32) Caps
  • Black-Anodized Aluminum Construction
  • Compatible with C-Mount Extension Tubes, Cameras, and Camera Lenses

These C-Mount Caps are designed to be used with our CCD/CMOS camerascamera lenses, and other C-Mount-threaded (1.00" -32) components. The CMCP1 features internal C-Mount threading while the CMCP2 features external C-Mount threading. Each of these caps is made from black-anodized aluminum and has a knurled edge for secure hand tightening.

To use one of these caps with a C-Mount-threaded CCD or CMOS camera, please choose the externally threaded CMCP2 cap.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CMCP1 Support Documentation
CMCP1Customer Inspired! Internally C-Mount-Threaded Cap
$18.83
5-8 Days
CMCP2 Support Documentation
CMCP2Customer Inspired! Externally C-Mount-Threaded Cap
$18.83
Today

Rubber Lens Tube Bellows

SM2B45
Click to Enlarge

View Imperial Product List
Item #QtyDescription
POLARIS-K2T32Polaris® SM2-Threaded Ø2" Mirror Mount, 3 Hex Adjusters, 2 Retaining Rings Included
POLARIS-CA12Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw
PLS-P1502Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.50"
SM2T22SM2 (2.035"-40) Coupler, External Threads, 1/2" Long
SM2T201SM2 (2.035"-40) Coupler, External Threads, 2" Long
SOLIS-525C1High-Power LED for Microscopy, 525 nm (Green), 2.4 W (Min)
SM2B451SM2 Lens Tube Bellows, 1.26" to 4.92" Long
View Metric Product List
Item #QtyDescription
POLARIS-K2T32Polaris® SM2-Threaded Ø2" Mirror Mount, 3 Hex Adjusters, 2 Retaining Rings Included
POLARIS-CA25/M2Flexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw
PLS-P373/M2Ø25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 37.3 mm
SM2T22SM2 (2.035"-40) Coupler, External Threads, 1/2" Long
SM2T201SM2 (2.035"-40) Coupler, External Threads, 2" Long
SOLIS-525C1High-Power LED for Microscopy, 525 nm (Green), 2.4 W (Min)
SM2B451SM2 Lens Tube Bellows, 1.26" to 4.92" Long
Secure lens tube connections with hose clamps for long-term stability.
SM1B3
Click for Details

The SM1B3 bellows contracts and expands from 1.50" to 8.66" long.
  • Light-Tight Rubber Bellows with Slip Cover Design
  • SM1B3: Fits Over Ø1" Lens Tubes, C-Mount Extension Tubes, or Other 1.2" Outer Diameter Objects
    • Adjustable in Length from 1.50" to 8.66" (38.0 - 220.0 mm)
  • SM2B45: Fits Over Ø2" Lens Tubes or Other 2.2" Outer Diameter Objects
    • Adjustable in Length from 1.26" to 4.92" (32.0 - 125.0 mm)

The SM1B3 and SM2B45 nitrile rubber bellows are designed to seal the gap between Ø1" and Ø2" lens tubes, respectively, and maintain a light-tight path. The SM1B3 features a 1.06" inner diameter that stretches over Ø1" lens tubes with either internal or external threads, and is adjustable in length from 1.50" to 8.66". The SM2B45 features a 2.05" inner diameter that stretches over Ø2" lens tubes with either internal or external threads, and is adjustable in length from 1.26" to 4.92". The stiff rubber construction ensures that the bellows do not reduce the clear aperture of the lens tube system while being compressed or stretched. These bellows can be used in temperatures from -30 to 100 °C.

Note: While soap and water is recommended to clean the SM1B3 and SM2B45, isopropyl alcohol may be used in moderate amounts as a cleaning agent. Acetone is not recommended, as it will cause damage to the nitrile rubber.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1B3 Support Documentation
SM1B3Customer Inspired! SM1 Lens Tube Bellows, Rubber, 1.50" to 8.66" Long
$49.78
Today
SM2B45 Support Documentation
SM2B45Customer Inspired! SM2 Lens Tube Bellows, Rubber, 1.26" to 4.92" Long
$59.41
Today

Ø1" Lens Tube Flexure Sleeve Couplers

SM1CPL
Click to Enlarge
SM1CPL Holding Two Ø1" Lens Tubes. A rubber gasket makes the coupler light tight.
SM1CPL Hex Screw
Click to Enlarge
Lens Tubes Are Secured by Tightening Two 5/64" Hex Screws
  • Flexure Coupler Holds Ø1" Lens Tubes, C-Mount Extension Tubes, or Other Ø1.2" Outer Diameter Cylindrical Objects
  • Available in Three Lengths: 0.5", 1.0", and 3.0"
  • RTV103 Black Silicone Gasket Provides Light-Tight Coupling
  • Lens Tubes can be Positioned Along the Entire Length, Facing Either Direction
  • 1.46" Outer Diameter

These Lens Tube Couplers are flexure-clamping sleeves that can hold any Ø1" lens tube, C-Mount extension tube, or other Ø1.2" outer diameter cylindrical object. A lens tube can be slid into each end of the coupler and secured by tightening the two 5/64" (2 mm) hex screws on the side of the sleeve.

Each coupler features a black silicone gasket along the clamping section to provide light-tight coupling of lens tubes (see photos to the right). Lens tubes can be clamped with either internal or external threads facing out and at any position along the length of the coupler as long as there are at least 6 mm of the tube inside the clamp.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1CPL05 Support Documentation
SM1CPL05SM1 Lens Tube Flexure Sleeve Coupler, 0.5" Long
$35.71
Today
SM1CPL10 Support Documentation
SM1CPL10SM1 Lens Tube Flexure Sleeve Coupler, 1.0" Long
$36.79
Today
SM1CPL Support Documentation
SM1CPLSM1 Lens Tube Flexure Sleeve Coupler, 3.0" Long
$53.02
Today

Slip-On Extension Tube Covers

SM1CPL
Click to Enlarge
SC1L24 Tube Cover Spanning the Gap Between a Camera and Turning Mirror
  • 24" Long Plastic Cover for C-Mount Extension Tubes
  • Easy to Slip On and Off

The SC1L24 lens tube cover is designed to fit over our C-Mount extension tubes or SM1 (Ø1") lens tubes. They can be used to span the gap between any two fixed lens tubes, thereby enclosing the light path in an optical setup. These plastic covers are easy to slip on and off and are sold in 24" lengths, which can be easily cut to the desired length by the end user.

Please note that these lens tube covers are not light tight. Additionally, their plastic construction makes them unsuitable for high-power laser applications.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SC1L24 Support Documentation
SC1L24Customer Inspired! SM1 Slip-On Lens Tube Cover, 24" Long
$10.50
Today

Aluminum Lens Tube Covers

Cutting a Lens Tube Cover to Length
Click for Details

Left: SC1K Tool Kit
Right: Cutting a Lens Tube Cover to Length

Click to Enlarge

SC600 Lens Tube Cover with SM1 Lens Tube Mounted in C127TC Clamp
  • Non-Flammable Lens Tube Covers
  • Raw Tubing Available in 6' (1828.8 mm) Length
  • Anodized Tubing Available in 2' (609.6 mm) Length
  • Fit Over Ø1" Lens Tubes, C-Mount Extension Tubes, or Other 1.2" Outer Diameter Objects
  • Aluminum Dust Cover Kit Contains Tools for Cutting and Crimping Aluminum Lens Tube Covers
  • 1.27" Outer Diameter

The SC600 and SC1800RL Aluminum Lens Tube Covers are designed to fit over SM1 (Ø1") lens tubes and are made from anodized and unanodized aluminum, respectively. These non-flammable covers can be easily cut to custom lengths using our SC1K Tool Kit. This kit contains a tubing cutter and de-burring tool, jig, and pliers, allowing the user to cut the aluminum covers and then crimp the edges to form a light press fit. For instructions on how to use these tools to cut and crimp the tubing to the desired length, please see the Cutting Tutorial tab at the top of the page.

These tube covers can be post-mounted using our C127TC Tube Clamp or mounted to 30 mm cage components with 4-40 mounting taps using our C128CC (each sold below).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SC1800RL Support Documentation
SC1800RLSM1 Aluminum Lens Tube Cover, 6' (1828.8 mm) Long
$79.54
Today
SC600 Support Documentation
SC600SM1 Anodized Aluminum Lens Tube Cover, 2' (609.6 mm) Long
$36.52
Today
SC1K Support Documentation
SC1KAluminum Dust Cover Tool Kit
$92.79
Today
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