The ThorLabs CM1L20 is an essential component for extending optical path lengths in C-mount and SM1-threaded systems. This extension tube is meticulously crafted from black-anodized aluminum, ensuring both durability and minimal internal reflections. Its dual compatibility with C-mount and SM1 threading allows for seamless integration into a wide array of optical setups, making it ideal for microscopy, imaging, and other applications where precise optical adjustments are crucial. The CM1L20 facilitates fine-tuning of focus and spacing, enabling users to achieve optimal image quality and system performance.

ThorLabs CM1L20 Extension Tube with C-Mount and SM1 Threading
The ThorLabs CM1L20 is a versatile extension tube designed for use with C-mount and SM1-threaded components. It allows for precise adjustments of optical path length in imaging and microscopy systems. Constructed from black-anodized aluminum for durability and minimal reflections, this extension tube provides a convenient and reliable solution for achieving optimal focus and spacing in various optical setups.
Product Condition & Availability
ThorLabs CM1L20 Extension Tube with C-Mount and SM1 Threading is in excellent working condition and has been thoroughly tested for performance and reliability. We offer both new and professionally refurbished options, depending on availability and customer preference.
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Integrated Solutions & Deployment Support
Beyond individual products, Aumictech provides end-to-end solutions for manufacturing line deployment and test station setup. Our team can assist with system integration, configuration, and equipment selection tailored to your production requirements.
Trusted Industry Experience
With over a decade of experience, Aumictech is a recognized leader in RF and optical test equipment sales and services. All units are supported by our in-house calibration and repair facility based in Downingtown, PA, ensuring technical reliability and long-term value.
Customer Commitment
We’re committed to exceptional customer service, offering a 15-day return or replacement (ROR) policy for peace of mind. Our team is always available to assist with pre- and post-sale support.
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We offer rapid global shipping through FedEx, UPS, and DHL, with most orders dispatched within 1–3 business days. Multiple secure payment options are available, including PayPal, ACH, wire transfers, and major credit cards.
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