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Celestron SCT to 2" Adapter
Celestron SCT to 2" Adapter
Celestron SCT to 2" Adapter
Celestron SCT to 2" Adapter

Celestron SCT to 2" Adapter

by Celestron
SKU CEL-93661
$27.95 - $27.95
$27.95
$27.95 - $27.95
$27.95
Price Match Policy!
  • Adapts standard SCT rear cell threads to accept 2" accessories
  • Threaded connection provides a secure, flex-free optical train
  • Brass compression ring grips eyepieces and cameras without scratching
  • Weighs just 3.9 oz (112 g)
  • Machined aluminum with a black anodized finish
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Celestron SCT to 2" Adapter

    The Celestron SCT to 2" Adapter provides a robust, secure connection from your telescope's rear cell to any standard 2-inch accessory, weighing only 3.9 oz (112 g). Measuring 53mm x 57.15mm, this precision-machined aluminum adapter replaces the standard visual back to eliminate instability in your imaging or visual setup.

    A Threaded SCT Interface for Maximum Stability

    Unlike standard visual backs that use simple set screws, the Celestron SCT to 2" Adapter threads directly onto the rear cell of your Schmidt-Cassegrain or Maksutov-Cassegrain. This direct-threaded connection creates a solid, flex-free link between your telescope and your 2" diagonal, eyepiece, or camera nosepiece. The result is a more rigid optical train that prevents accessories from tilting or sagging under load, which is critical for astrophotography.

    The 2" Brass Compression Ring System

    This adapter protects your investment in 2" accessories. Instead of a simple set screw that can dent or scratch the barrel of your eyepieces, it uses a brass compression ring. As you tighten the locking screw, the soft brass ring gently and evenly closes around the accessory, providing a firm, 360-degree grip that won't mar the finish, ensuring your gear stays in pristine condition.

    • Non-Marring Grip: The soft brass material prevents scratches and dents on your 2" diagonals and eyepieces.
    • Secure Hold: The compression mechanism provides a more secure hold than a single set screw, reducing the risk of accessories slipping.
    • Black Anodized Finish: The machined aluminum body is black anodized for corrosion resistance, and the interior is blackened to reduce internal reflections and improve contrast.

  • Why do I need the Celestron SCT to 2" Adapter instead of the one that came with my telescope?

    The standard 1.25" visual back included with most SCTs is a limiting factor. This adapter allows you to use larger 2" eyepieces for wider fields of view and 2" diagonals for a more robust setup. Its brass compression ring also grips heavier 2" cameras and eyepieces firmly without scratching or denting their barrels.

    How does the brass compression ring on this adapter work?

    When you tighten the thumbscrew, it doesn't press directly on your accessory. Instead, it pushes a flexible brass ring inward, which then uniformly grips the entire circumference of your eyepiece or camera nosepiece. This provides a secure, centered hold without causing the scratches and dents that a direct steel screw would.

    Will the Celestron SCT to 2" Adapter add significant weight to my 8" SCT setup?

    No, at just 3.9 oz (112 g), the adapter adds minimal weight to your optical train. Its machined aluminum construction keeps it lightweight yet strong, so you won't need to make significant changes to your counterweight balance for visual use.

    Can I use this adapter for astrophotography with my Celestron telescope?

    Absolutely. The rigid, threaded connection is ideal for astrophotography. It prevents the camera from tilting, which can cause misshapen stars at the edge of the field. It provides a solid foundation for connecting a 2" camera nosepiece or other imaging accessories.

    Is this adapter compatible with all Celestron SCTs?

    This adapter fits Celestron Schmidt-Cassegrain and Maksutov-Cassegrain telescopes that have the standard SCT rear thread. Telescopes with a larger rear thread, such as the C11, C14 and EdgeHD 9.25, 11 and 14, need their adapter plate first, and models without the SCT thread, such as small Maksutovs like the C90, will not take it.

    Will this adapter help me see the entirety of the Andromeda Galaxy (M31) in my C11?

    This adapter is the first step. By allowing you to use a 2" diagonal and a low-power, wide-field 2" eyepiece, it enables the widest possible true field of view your C11 can deliver. This is essential for framing large deep-sky objects like the Andromeda Galaxy (M31) or the Pleiades (M45).

  • Size 53mm x 57.15mm (2.125" x 2.25")
    Weight 3.9 oz (112 g)
    Color Black
    Material Aluminum
    Warranty 2-Year Warranty

    • SCT to 2" Adapter

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  • Celestron 2-Year Warranty