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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 Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)
Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)

Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)

by Baader Planetarium
SKU BAA-2958500B
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
Price Match Policy!
  • Adds only 7mm of optical length to your imaging train
  • Connects 2" female SCT threads to male T-2 (M42x0.75) threads
  • Ultra-short design preserves critical back-focus space
  • Ideal for use with focal reducers and off-axis guiders
  • Precision machined for a rigid, flex-free connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)

    The Baader Ultra Short T-Adapter is a critical component for Schmidt-Cassegrain telescope (SCT) imagers, connecting a standard female 2-inch SCT thread to a male T-2 thread while consuming a minimal 7mm of optical length. This ultra-compact design is engineered specifically to solve back-focus problems, enabling the use of complex imaging trains with accessories like focal reducers, filter wheels, and off-axis guiders where every millimeter is crucial.

    The 7mm Solution for Critical SCT Back-Focus

    SCTs, especially when used with f/6.3 or f/7 focal reducers, have a strictly defined back-focus distance that must be maintained for optimal correction. The Baader Ultra Short T-Adapter addresses this by providing the most compact connection possible between the telescope's rear cell and your T-threaded accessories. Its 7mm optical path leaves maximum room for essential equipment, preventing situations where you cannot reach focus with a full imaging setup.

    Baader's 7mm Adapter vs. Standard T-Adapters: Reclaiming Optical Path

    Standard SCT T-adapters can often consume 25mm or more of back-focus, which is often too much for a complete OAG and filter wheel configuration. By replacing a bulky adapter with this 7mm Baader component, you reclaim precious optical path. This can be the single deciding factor that allows you to add an off-axis guider to your train or achieve the correct sensor spacing for a field flattener, ensuring sharp stars across the entire frame.

  • Why is the Baader Ultra Short T-Adapter's 7mm length so important for an SCT with an f/6.3 reducer?

    An f/6.3 focal reducer has a specific back-focus requirement (typically around 105mm) for proper optical correction. The Baader Ultra Short T-Adapter's minimal 7mm optical length maximizes the available space within that budget for your camera, filter wheel, and off-axis guider, which a longer, standard adapter might prevent.

    Can I use the Baader Ultra Short T-Adapter to attach my ZWO ASI camera to a Celestron 8" SCT?

    Yes. This adapter is perfect for that application. The 2" female SCT thread screws directly onto the rear cell of the Celestron 8" SCT, and the male T-2 thread connects to the T-ring or main body of most ZWO ASI cameras and their included T-2 spacers.

    What problem does the Baader Ultra Short T-Adapter solve?

    It solves the problem of running out of back-focus. Many SCT imagers find they cannot reach focus after adding accessories like an off-axis guider because their standard adapter is too long. This ultra-short adapter reclaims that lost space, often making a previously impossible imaging configuration viable.

    What are the exact threads on the Baader Ultra Short T-Adapter?

    The adapter features a female 2" SCT thread (2"-24 TPI) on the telescope side and a male T-2 thread (M42x0.75) on the camera/accessory side. This is a standard combination for most SCTs and astronomy cameras.

    Will this Baader adapter introduce flexure into my imaging train?

    No. The Baader Ultra Short T-Adapter is machined from high-grade aluminum to precise tolerances. Its single-piece construction and secure threading provide a rigid, flex-free connection, which is essential for maintaining alignment and producing sharp images.

    Is the Baader Ultra Short T-Adapter compatible with other Baader T-2 system components?

    Absolutely. This adapter is a core part of the Baader Astro T-2 System. It allows you to seamlessly integrate your SCT with the extensive range of Baader T-2 extension tubes, changers, and other accessories to build a fully threaded, modular imaging setup.

  • Optical Length 7mm
    Telescope Side Connection 2" SCT Female Thread (2"-24 TPI)
    Accessory Side Connection T-2 Male Thread (M42x0.75)
    Net weight (kg) 0.03
    Inner Diameter / Clear Aperture (mm) 39
    Outer Diameter 56
    Type of Adapter Reducing Adapter
    Inner Connection (lens sided) 2"/SCT Thread (50.8mm)
  • Baader Planetarium Warranty