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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 Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter
Baader Planetarium S58 to M68a Adapter

Baader Planetarium S58 to M68a Adapter

by Baader Planetarium
SKU BAA-2458632
$80.00 - $80.00
$80.00
$80.00 - $80.00
$80.00
Price Match Policy!
  • Adapts S58-long threads to the M68a standard
  • Low-profile "short" design minimizes back focus consumption
  • Engineered for the Baader BACHES Echelle-spectrograph
  • Enables use of specific 2-inch mirror and prism diagonals
  • Provides a rigid, secure mechanical connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Baader Planetarium S58 to M68a Adapter

    The Baader Planetarium Adapter S58-long to M68a (short) creates a critical, low-profile connection between components using the S58 thread and the widely adopted M68 system. Specifically designed for use with the Baader BACHES Echelle-spectrograph and select 2" mirror or prism diagonals, this adapter ensures a secure, light-tight fit while minimizing the consumption of precious back focus in a complex optical train.

    A Low-Profile S58 to M68a Connection

    This adapter solves the specific mechanical challenge of integrating specialized S58-threaded accessories into an optical train built around the robust M68 standard. It allows you to attach instruments like the BACHES spectrograph to M68-threaded focusers or accessories, maintaining system rigidity and alignment.

    The "short" designation is key; the adapter is engineered to add minimal length to the optical path. This is crucial for imagers and spectroscopists who are often working within tight back focus tolerances, especially when using reducers, flatteners, or other optical correctors.

    • BACHES Spectrograph Integration: Provides the necessary thread conversion to attach the BACHES spectrograph directly to an M68-threaded focuser or accessory train.
    • 2" Diagonal Compatibility: Allows the use of specific 2" diagonals that feature an S58 input thread with M68-threaded telescope visual backs or focusers.

  • What is the primary purpose of the Adapter S58-long to M68a (short)?

    Its primary purpose is to connect Baader accessories with an S58 thread, such as the BACHES spectrograph or certain 2" diagonals, to a telescope or focuser that uses the M68 thread system. Its "short" design minimizes the optical path length consumed.

    Will this Adapter S58-long to M68a (short) work with any S58 accessory?

    It is specifically designed to adapt from the S58-long thread standard. While it may be physically compatible with other S58 accessories, it is optimized for use with the Baader BACHES spectrograph and select Baader 2" mirror/prism diagonals.

    I have a Baader BACHES spectrograph and want to connect it to my focuser with an M68 output. Is the Adapter S58-long to M68a (short) the correct part?

    Yes, this is the intended application. The adapter converts the S58 thread on the BACHES spectrograph to the M68 thread on your focuser, providing a secure and rigid connection for spectroscopy.

    Why is a "short" adapter like the Adapter S58-long to M68a (short) important?

    A "short" or low-profile adapter is crucial for maintaining back focus. Many imaging systems with reducers or flatteners have very strict spacing requirements, and this adapter uses as little of that available distance as possible.

    What do "S58" and "M68" refer to on the Adapter S58-long to M68a (short)?

    S58 and M68 are thread standards. M68 (specifically M68x1) is a common large-format thread used on high-end focusers and accessories for its rigidity. S58 is a specific thread used by Baader Planetarium on certain instruments like the BACHES spectrograph.

    Can I use the Adapter S58-long to M68a (short) to attach a camera with M68 threads to a Baader 2" diagonal with an S58 thread?

    Yes, if your Baader 2" diagonal has the female S58 thread, this adapter will provide the male M68 thread needed to start building a camera train. You will still need to ensure you have the correct additional spacers to reach the proper back focus for your camera sensor.

  • Baader Planetarium Warranty