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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 2" Locking Ring for SCTs 8"/9.25"/11"/14"
Baader 2" Locking Ring for SCTs 8"/9.25"/11"/14"
Baader 2" Locking Ring for SCTs 8"/9.25"/11"/14"

Baader 2" Locking Ring for SCTs 8"/9.25"/11"/14"

by Baader Planetarium
SKU BAA-2458270
$71.00 - $71.00
$71.00
$71.00 - $71.00
$71.00
Price Match Policy!
  • Direct-threads to the rear cell of Schmidt-Cassegrain telescopes
  • Compatible with 8", 9.25", 11", and 14" SCT models
  • Designed for Baader 2" zenith prisms and mirrors
  • Low-profile, space-saving design to conserve back focus
  • Creates a rigid, non-flexing connection for imaging
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader 2" Locking Ring for SCTs 8"/9.25"/11"/14"

    The Baader 2" Locking Ring replaces the standard visual back on 8", 9.25", 11", and 14" Schmidt-Cassegrain telescopes, creating a direct-thread connection for Baader 2" zenith prisms and mirrors. This space-efficient design minimizes the optical path length, which is critical for achieving focus with accessories that require significant back focus.

    A Secure, Low-Profile Connection for 2" Baader Accessories

    By threading directly onto your telescope's rear cell, this locking ring establishes a solid, metal-on-metal junction between the telescope and your 2" Baader diagonal or other accessory. This configuration increases rigidity and eliminates the potential for tilt or play that can be introduced by standard thumbscrew-based visual backs, ensuring your optical train remains perfectly aligned.

    Baader Locking Ring vs. Standard SCT Visual Back: Why Direct Threading Matters

    A standard SCT visual back offers the convenience of quick accessory changes, but its slip-fit design can be a source of flexure, especially with heavy 2" eyepieces or imaging cameras. The Baader 2" Locking Ring prioritizes stability over convenience. The direct-thread attachment creates a single, rigid unit with the telescope tube, preventing image shift and preserving the tight collimation required for high-resolution planetary imaging and deep-sky astrophotography.

  • What is the main advantage of the Baader 2" Locking Ring for SCTs?

    Its primary advantage is creating a rigid, low-profile connection for Baader 2" accessories. By threading directly onto the SCT's rear port, it eliminates the flex and tilt common with standard slip-fit visual backs, while also saving valuable back focus distance.

    Will the Baader 2" Locking Ring help me reach focus with a binoviewer on my Celestron EdgeHD 11"?

    Yes, this is a key application. Binoviewers often require a large amount of inward focus travel that SCTs cannot provide with a standard diagonal. The space-efficient design of the Baader 2" Locking Ring shortens the overall light path, often providing the critical millimeters needed to bring a binoviewer to focus on an 11" SCT without a Barlow or optical corrector.

    Is this Baader locking ring compatible with non-Celestron SCTs like Meade models?

    This ring is designed for the standard 2" male thread found on the rear cell of Celestron 8", 9.25", 11", and 14" SCTs. While many Meade SCTs use a similar thread, compatibility is not guaranteed. It is best to confirm the thread specification of your specific telescope model before purchasing.

    I'm imaging the Andromeda Galaxy (M31) with a focal reducer on my 9.25" SCT. How does this ring help?

    When using a focal reducer, maintaining the precise back focus distance to the camera sensor is critical for a flat field. The Baader 2" Locking Ring provides a short, solid connection that helps you stay within that tolerance. More importantly, its rigidity prevents any tilt in the imaging train, which would otherwise result in elongated stars in the corners of your images of M31.

    How does the Baader 2" Locking Ring secure the accessory?

    The ring itself threads onto the back of the telescope. You then thread your Baader 2" accessory (like a ClickLock diagonal) into the ring. This creates a fully threaded, secure system with no thumbscrews or compression rings involved in the primary connection to the telescope.

    What is the trade-off of using the Baader 2" Locking Ring?

    The main trade-off is convenience. Unlike a standard visual back where you can quickly swap accessories with a thumbscrew, this system requires you to thread and unthread your diagonal. It is designed for observers and imagers who prioritize mechanical stability for a dedicated setup over the ability to rapidly change configurations.

  • Net weight (kg) 0.04
    Compatible Brands UNC, Celestron
    Inner Diameter / Clear Aperture (mm) 50
    Outer Diameter 97
    Type of Adapter Same-Thread Adapter, Variable Focusing
    Optical length (mm) 5
    Inner Connection (eyepiece/-camera-sided) 2"/SCT Thread (50.8mm)
    Inner Connection (lens sided) 2"/SCT Thread (50.8mm)
    Adaptable to Celestron SC's 8"/9.25"/11"/14"

    • Baader 2" Locking Ring for SCTs 8"/9.25"/11"/14"

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  • Baader Planetarium Warranty