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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.
Baader Ultrashort Clamp - 1.25"/T-2

Baader Ultrashort Clamp - 1.25"/T-2

by Baader Planetarium
SKU BAA-2458121
$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00
Price Match Policy!
  • Connects 1.25" accessories to T-2 threads
  • Ultrashort design minimizes optical path length
  • Ideal for complex imaging trains with limited back focus
  • Securely holds eyepieces and camera nosepieces
  • Prevents marring of accessory barrels
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Ultrashort Clamp - 1.25"/T-2

    The Baader Ultrashort 1.25"/T-2 Clamp is an essential component for astrophotographers building precise imaging trains where every millimeter of back focus is critical. It provides a secure, self-centering connection for any 1.25" accessory to a standard T-2 (M42x0.75) thread while consuming the absolute minimum optical path length. This adapter is the solution for achieving focus when integrating accessories like filter wheels, off-axis guiders, or adaptive optics into a system with strict back-focus requirements.

    Baader Ultrashort Clamp: Solving Back-Focus in T-2 Systems

    Modern imaging systems, especially those using field flatteners or focal reducers, have a fixed and often very limited back-focus distance. The Baader Ultrashort Clamp is engineered specifically to address this constraint. By eliminating unnecessary length, it allows you to fit more components into the optical path without preventing the system from reaching a sharp focus.

    This makes it indispensable for connecting guide cameras, planetary cameras with 1.25" nosepieces, or eyepieces for parfocal alignment within a T-2 threaded setup. Where a standard adapter would consume too much of your available focus travel, the Ultrashort Clamp ensures you have the room needed for your critical accessories.

    Secure, Non-Marring Grip for 1.25" Accessories

    Unlike basic adapters that rely on simple thumbscrews, a high-quality clamp provides a more secure and gentle grip on your valuable accessories. This mechanism ensures that your camera nosepiece or eyepiece is held perfectly concentric with the optical axis, which is vital for maintaining collimation and achieving sharp, round stars across the field.

    The clamping action distributes pressure evenly around the barrel, preventing the scratches and gouges that thumbscrews can cause. This not only preserves the cosmetic condition of your equipment but also provides a more stable connection that is less likely to shift or tilt during an imaging session.

  • What is the primary use for the Baader Ultrashort Clamp?

    The primary use is to connect a 1.25" accessory (like a camera nosepiece or eyepiece) to a T-2 threaded component (like a filter wheel or off-axis guider) while using the smallest possible amount of optical path. It's a problem-solver for astrophotographers with limited back focus.

    How does the Baader Ultrashort Clamp help with accessories on my SCT?

    When using a focal reducer on a Schmidt-Cassegrain Telescope (SCT), you have a specific back-focus distance you must maintain for optimal correction. The Baader Ultrashort Clamp allows you to insert 1.25" accessories into your T-2 threaded imaging train without exceeding that critical distance, ensuring your field remains flat and stars are sharp to the edge.

    Will this clamp hold my 1.25" accessories securely without wobble?

    Yes. The clamp design is inherently more secure than a simple thumbscrew adapter. It provides a positive, self-centering grip around the entire barrel of your accessory, preventing tilt and ensuring a rigid connection to your imaging train.

    Can I use the Baader Ultrashort Clamp for connecting a guide camera to an off-axis guider?

    This is an excellent application for the clamp. If your off-axis guider (OAG) has a T-2 threaded port for the guide camera and your guide camera uses a 1.25" nosepiece, this clamp provides the tight, low-profile connection needed to reach focus on the guide star, which often requires precise spacing.

    What are T-2 threads on the Baader Ultrashort Clamp?

    T-2 threads (also known as M42x0.75) are a universal standard in astronomy for connecting accessories. This clamp features female T-2 threads, allowing it to screw directly onto a wide range of flatteners, reducers, filter wheels, and other T-2 compatible equipment.

    Is the Baader Ultrashort Clamp just for imaging, or can I use it for visual observing?

    While designed with imaging in mind, it is perfectly suitable for visual use. If you have a T-2 diagonal or other T-2 accessory and need to use a 1.25" eyepiece, this provides a very secure, high-quality connection that is superior to basic adapters.

  • Net weight (kg) 0.05
    Clamping System Screw clamps
    Inner Diameter / Clear Aperture (mm) 1.25" (31.75mm)
    Outer Diameter 52
    Type of Adapter Eyepiece Clamp
    Optical length (mm) 20
    T-2 Part # 8C
    Inner Connection (eyepiece/-camera-sided) ø 1¼" (31.75 mm)
    Inner Connection (lens sided) M42 x 0.75 (T-2)
    Adaptable to Guiding Cameras
  • Baader Planetarium Warranty