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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.
Shelyak T-mount adapter ring for SCT
Shelyak T-mount adapter ring for SCT
Shelyak T-mount adapter ring for SCT

Shelyak T-mount adapter ring for SCT

by Shelyak
SKU SHK-BA0027
$91.00 - $91.00
$91.00
$91.00 - $91.00
$91.00
Price Match Policy!
  • Connects Shelyak spectrographs to Schmidt-Cassegrain telescopes
  • Male M42x0.75 T-mount thread for instrument connection
  • Female 2-inch thread for SCT rear-cell attachment
  • Fully compatible with standard 0.63x focal reducers
  • Provides a rigid, tilt-free threaded connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • T-mount adapter ring for SCT

    This T-mount adapter ring for SCT provides a direct M42x0.75 T-thread connection for your spectrograph, attaching securely to the 2-inch rear cell thread of standard Meade and Celestron telescopes. This essential component is engineered to create a rigid optical train and is fully compatible with common 0.63x focal reducers, allowing you to optimize your SCT's focal ratio for spectroscopy.

    Secure M42x0.75 Connection for Shelyak Spectrographs

    Designed for scientific instrumentation, this adapter creates a solid, threaded link between your telescope and spectrograph. It is the ideal solution for attaching Shelyak instruments like the Alpy 600, LISA, or UVEX to any Schmidt-Cassegrain telescope or accessory with a standard 2-inch male thread.

    The male M42x0.75 T-threads ensure a non-flexing, perfectly aligned connection to your instrument. Compared to a simple slip-fit nosepiece, this threaded adapter eliminates the possibility of tilt or sag, which is critical for maintaining precise focus and calibration during long spectroscopic exposures.

    Full Compatibility with 0.63x SCT Focal Reducers

    This adapter is specifically designed to work seamlessly with the classic 0.63x focal reducers used on most SCTs. By placing the reducer between the telescope and this adapter, you can shorten your instrument's effective focal length and increase its light-gathering speed.

    Achieving a faster focal ratio is highly advantageous for spectroscopy, as it concentrates more light onto the spectrograph's slit, increasing signal-to-noise ratio and reducing required exposure times for faint targets. This adapter ensures you can integrate a reducer into your imaging train without compatibility issues.

  • What is the primary use for this SCT T-mount adapter ring?

    This adapter's primary function is to connect an instrument with a female T-thread (M42x0.75), such as a Shelyak spectrograph or a DSLR camera with a T-ring, directly to the rear cell of a Schmidt-Cassegrain telescope (SCT) that uses a standard 2-inch thread.

    Which specific Shelyak instruments is this SCT T-mount adapter designed for?

    This adapter is confirmed to be compatible with a range of Shelyak instruments, including the eShel FIGU, Alpy 600, LISA, and UVEX spectrographs, allowing them to be securely mounted on Meade or Celestron SCTs.

    Will this adapter work with my Celestron EdgeHD 8" telescope?

    Yes. The Celestron EdgeHD 8" uses the standard 2-inch SCT thread on its rear cell, making it fully compatible with this adapter. You can thread the adapter directly onto the telescope's visual back or onto a compatible focal reducer.

    Can I use this SCT T-mount adapter with a 0.63x focal reducer on my Meade LX200?

    Absolutely. This adapter is specifically designed for this scenario. You would first thread your 0.63x reducer onto the rear cell of your Meade LX200, and then thread this adapter onto the male threads of the focal reducer.

    What are the thread sizes on this SCT T-mount adapter ring?

    The adapter features two standard threads:

    • Telescope Side: A female 2-inch (50.8mm) thread to attach to an SCT.
    • Instrument Side: A male M42x0.75 T-mount thread to attach to a camera or spectrograph.

    Why should I use this threaded SCT T-mount adapter instead of a 2" nosepiece for my spectrograph?

    A threaded connection is significantly more secure and rigid than a slip-fit nosepiece held by set screws. For sensitive applications like spectroscopy, this adapter prevents instrument tilt and flexure, ensuring that your calibration and focus remain stable throughout an imaging session.

  • Instrument Connection Male T-Thread (M42x0.75)
    Telescope Connection Female 2-inch SCT Thread
    Compatibility Shelyak eShel FIGU, Alpy 600, LISA, UVEX; 0.63x Focal Reducers

    • T-mount adapter ring for SCT

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  • Shelyak 1-Year Warranty