T-mount

Thorlabs offers couplers, caps, and tube covers compatible with our C-Mount 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.

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Telecentriclens

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These tube covers can be post-mounted using our C127RC(/M) Slip Ring or C127TC Tube Clamp. It is also possible to mount these to 30 mm cage components with 4-40 mounting taps using our C128CC Adapter Clamp (each sold below).

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).

C-mountlens

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.

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M42mount

The lens cap can be placed on an internally C-mount threaded component by squeezing the protruding edge of the cap, inserting the back of the cap into the threads, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results.

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C mount1 32 un 2b

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.

These C-Mount Caps are designed to be used with our CMOS cameras, camera 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.

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Lens mount

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).

Csmount

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.

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.

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Nikon Fmount

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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.

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

The CMEC2 plastic dust cap snaps onto internally C-Mount-threaded (1.00"-32) components, such as our CMOS cameras and C-mount extension tubes. By sealing off the end of C-Mount camera accessory or lens tube, this cap helps to protect optics against dust and debris while not in active use. The CMEC2 cap has an outer diameter of 30.5 mm (1.2").

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.

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.

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.