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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
ZWO T2 To C/CS Adapter
ZWO T2 To C/CS Adapter
ZWO T2 To C/CS Adapter

ZWO T2 To C/CS Adapter

by ZWO
SKU ZWO-T2-CS
$12.00 - $12.00
$12.00
$12.00 - $12.00
$12.00
Price Match Policy!
  • Connects C-mount and CS-mount lenses to T2-threaded cameras
  • Adds a precise 7mm to the optical path length
  • Standard M42x0.75 female threads for universal camera compatibility
  • All-metal, black anodized construction minimizes reflections
2 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • ZWO T2 to C/CS Adapter

    The ZWO T2 to C/CS Adapter connects lenses with C or CS-mount threads to any camera body using the standard M42 T2-thread. This all-metal adapter adds a fixed optical length of 7mm, establishing the correct back focus for both C-mount (17.5mm) and CS-mount (12.5mm) lens standards when paired with compatible ASI cameras.

    Dual C/CS Lens Compatibility with 7mm Optical Length

    This adapter provides a single, robust solution for two distinct lens standards. It presents standard female M42 (T2) threads to your camera and accepts male C or CS threads from the lens. The adapter's fixed 7mm thickness is the key dimension that correctly positions the sensor relative to the lens's focal plane.

    • C-Mount Lens Back Focus: Results in a 17.5mm back focus distance.
    • CS-Mount Lens Back Focus: Results in a 12.5mm back focus distance.
    • Durable Construction: Machined from black anodized aluminum to ensure a secure, non-reflective connection in your imaging train.

    Adapting Guide Scopes and All-Sky Lenses with M42 Threads

    The primary function of the T2-CS adapter is to let you repurpose widely available and affordable C/CS lenses for astronomical use. This is especially useful for creating compact, lightweight guide scope setups or for wide-field meteor cameras where a full telescope is unnecessary. The universal M42 T2-thread ensures it will connect to the vast majority of dedicated astronomy cameras, not just ZWO models.

  • What is the ZWO T2-CS adapter used for?

    The ZWO T2-CS adapter connects a C-mount or CS-mount lens (commonly used in security and machine vision) to an astronomy camera that has standard M42 T2-threads. This allows you to use compact, fast lenses for applications like autoguiding, all-sky imaging, or wide-field astrophotography.

    How does the ZWO T2-CS adapter handle both C and CS lenses?

    The adapter physically accepts both C and CS-mount threads. The resulting back focus distance changes depending on which type of lens you attach. With a C-mount lens, the back focus is 17.5mm. With a CS-mount lens, the back focus is 12.5mm. You must ensure your camera's sensor-to-flange distance is compatible with these values.

    What is the optical path length of the ZWO T2-CS adapter?

    The adapter itself has a physical thickness, or optical path length, of exactly 7mm. This dimension must be included in your back focus calculations when building your imaging train.

    Can I use the ZWO T2-CS adapter to attach a security camera lens to my ASI120MM Mini for guiding?

    Yes, this is an ideal application. The ASI120MM Mini has a 12.5mm back focus, which perfectly matches the 12.5mm back focus achieved when using a CS-mount lens with this adapter. This combination creates an extremely compact and effective autoguiding system.

    Will the ZWO T2-CS adapter let me connect an f/1.4 C-mount lens to my ASI585MC for meteor imaging?

    Yes. The ZWO T2-CS adapter connects the C-mount lens to the M42 threads on the ASI585MC. However, the ASI585MC has a back focus of 6.5mm or 17.5mm. To use a C-mount lens, which requires 17.5mm of back focus with this adapter, you would need to ensure you are using the camera configuration that provides that exact spacing.

    Are there any other adapters needed to use the ZWO T2-CS adapter?

    No, this is a direct, one-piece adapter. One side threads into your camera's M42 T2-threads, and the other side threads onto your C or CS-mount lens. No other parts are required for the connection itself.

  • SKU ZWO-T2-CS
    Adapter Type (Camera Side) M42 (T or T2)
    Adapter Type (Lens Side) C or CS
    Optical Length 7 mm
    Warranty ZWO - 2 Years

    • T2 to CS Adapter

      × 1

  • ZWO 2-Year Limited Warranty