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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.
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.
Baader C-Mount/T-2 Extension Ring

Baader C-Mount/T-2 Extension Ring

by Baader Planetarium
SKU BAA-2958521
$54.00 - $54.00
$54.00
$54.00 - $54.00
$54.00
Price Match Policy!
  • Connects female 1" C-mount threads to male T-2 threads
  • Adapts industrial, scientific, and video cameras to astronomical accessories
  • Functions as a fixed-length extension ring for achieving correct spacing
  • Machined for precise alignment and a secure, non-flexing connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader C-Mount/T-2 Extension Ring

    The Baader C-Mount/T-2 Extension Ring is a specialized adapter that integrates cameras and accessories using the 1-inch C-mount internal thread with the extensive T-2 (M42x0.75) system of astronomical hardware. This component acts as both a physical converter and a fixed extension, enabling the use of industrial, scientific, or security cameras in custom telescope imaging trains.

    Bridge C-Mount Cameras to the T-2 Standard

    This ring directly addresses a common connection challenge: mating a camera with female C-mount threads to an accessory with male T-2 threads. Its primary function is to establish a secure, standardized connection point, allowing you to incorporate C-mount cameras—often used in scientific, industrial, or video applications—into a conventional astronomical optical path with T-2 filter wheels, off-axis guiders, or spacers.

    A Critical Component for Custom Optical Trains

    Beyond simple adaptation, this component also acts as an extension tube, providing a fixed amount of spacing in an optical train. This is essential when you need to achieve the correct back focus for a reducer, flattener, or other optical corrector when using a C-mount camera. The rigid, threaded design ensures perfect alignment and stability, which is critical for maintaining image quality without flexure.

  • What is the primary use for the Baader C-Mount/T-2 Extension Ring?

    The primary use of the Baader C-Mount/T-2 Extension Ring is to connect a camera with female C-mount threads to an astronomical accessory (like a filter wheel or off-axis guider) that uses the male T-2 thread standard. It both adapts the thread type and adds a fixed amount of extension.

    Which devices typically use a C-mount thread that would need this Baader Extension Ring?

    C-mount threads are common on a variety of cameras outside of mainstream astronomy. This includes industrial machine-vision cameras, scientific cameras for microscopy, and some specialized high-frame-rate video cameras. This Baader adapter allows you to use these cameras on a telescope.

    Can I use the Baader C-Mount/T-2 Extension Ring to connect a T-2 filter wheel to my C-mount planetary camera?

    Yes, this is an ideal application. If your planetary camera has female C-mount threads and your filter wheel has a male T-2 thread on the telescope side, this Baader ring will create the necessary physical connection between them.

    Does this Baader adapter change the magnification or focal length?

    No, the Baader C-Mount/T-2 Extension Ring is a purely mechanical adapter with no optical elements. It does not alter the magnification or focal length of your telescope system. It only changes the physical spacing.

    Is the "T-2" thread on this Baader ring the same as a standard M42 camera lens mount?

    No, this is a common point of confusion. The T-2 thread is M42x0.75 (a 0.75mm thread pitch). The standard "M42" or Pentax screw mount for camera lenses is M42x1.0 (a 1.0mm thread pitch). The two are not compatible, and attempting to force them together will damage the threads.

    How do I know if I need this specific Baader extension ring?

    You need this Baader ring if you are trying to solve two problems at once: you must connect a female C-mount port to a male T-2 thread, AND you require a small, fixed amount of spacing to reach proper back focus. If you only need to adapt the threads without adding length, a different zero-profile adapter may be more suitable.

  • Internal Thread 1" C-Mount (Female)
    External Thread T-2 / M42x0.75 (Male)
    Function Thread Adapter & Extension Ring
    Net weight (kg) 0.01
    Inner Diameter / Clear Aperture (mm) 24.5
    Outer Diameter 42
    Type of Adapter Camera Adapter, Expanding Adapter
    Optical length (mm) 0-6

    • Baader C-Mount/T-2 Extension Ring

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  • Baader Planetarium Warranty