Skip to content
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 T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm

Baader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm

by Baader Planetarium
SKU BAA-2457910
$9.00 - $27.00
$27.00
$9.00 - $27.00
$27.00
Price Match Policy!
  • Precision T-2 thread shims for rotational alignment
  • Available in 0.3mm, 0.5mm, and 1.0mm thicknesses
  • Ultra-thin design minimizes impact on back focus
  • Stackable for fine-tuning component orientation
  • Durable and lightweight aluminum construction
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Baader T-2 Fine-Adjustment Aluminum Rings

    The Baader T-2 Fine-Adjustment Aluminum Rings solve the critical problem of rotational alignment in T-2 (M42x0.75) threaded systems with three precise thicknesses of 0.3mm, 0.5mm, and 1.0mm. These unthreaded shims provide a simple mechanical solution for orienting cameras or filter wheels, with the 0.3mm ring adding approximately 2/5 of a turn and the 1.0mm ring adding a full 1 1/3 turns of rotation to your accessory.

    T-2 Rotational Alignment: 0.3mm, 0.5mm, and 1mm Increments

    When you thread a T-2 accessory into place, it often tightens at an inconvenient angle, leaving your camera tilted or an off-axis guider port blocked. The Baader Fine-Adjustment Rings correct this by inserting a precise, ultra-thin gap. A 0.3mm ring provides roughly 2/5 of a turn, a 0.5mm ring adds 2/3 of a turn, and the 1.0mm ring gives 1 1/3 turns, allowing you to dial in the perfect orientation.

    Because the rings are not threaded, they simply drop in between any two T-2 components before you tighten them. You can also stack rings of different thicknesses—for example, combining a 0.3mm and a 0.5mm ring—to achieve intermediate adjustments and gain complete control over your imaging train's final orientation.

    Minimal Back Focus Impact: Adjustments as Small as 0.3mm

    In many optical systems, especially those with reducers or flatteners, every millimeter of back focus is critical. Standard extension tubes are too thick for rotational tuning, as they consume too much of this precious distance. The Baader rings, starting at just 0.3mm, add a negligible amount to the optical path length.

    This allows you to solve your alignment problem without compromising the optical spacing required for a flat, corrected field. Made from lightweight aluminum, these rings add no significant weight or length, making them an essential and unobtrusive tool for perfecting any T-2 threaded imaging setup.

  • How do I use the Baader T-2 Fine-Adjustment Rings to level my camera?

    First, thread your camera onto your flattener or focuser and note how much further it needs to rotate to be level. If it's a little less than half a turn, start with the 0.3mm ring. Simply unthread the camera, drop the ring onto the male T-2 threads, and re-thread the camera. It will now tighten at the correct orientation. If more rotation is needed, try the 0.5mm or 1.0mm rings, or stack them.

    Are the Baader T-2 rings threaded?

    No, they are not threaded. They are precision-machined flat shims, also known as Delrin rings. They are designed to sit between the shoulder of a male T-2 thread and the face of a female T-2 thread to prevent the components from seating completely, thereby adjusting the final rotational position.

    Can I stack multiple Baader T-2 adjustment rings?

    Yes. The rings are designed to be stacked to achieve finer control over rotation. For example, if the 0.5mm ring provides too much rotation and the 0.3mm ring isn't quite enough, you can try stacking two 0.3mm rings (for 0.6mm total) or a 0.3mm and a 0.5mm ring (for 0.8mm total) to find the exact spacing needed.

    How much back focus do these Baader T-2 rings consume?

    Each ring adds its exact thickness to the back focus distance of your optical train. The 0.3mm ring adds 0.3mm of back focus, the 0.5mm ring adds 0.5mm, and the 1.0mm ring adds 1.0mm. This is a negligible amount for most systems and is far superior to using thicker, threaded spacers for rotational adjustment.

    Will a 0.5mm Baader T-2 ring fix my off-axis guider from colliding with my filter wheel?

    Yes, this is a perfect application. If your OAG prism housing or guide camera hits the filter wheel body when fully tightened, adding a 0.5mm ring will provide about 2/3 of a turn of extra rotation. This is often enough to move the OAG into a clear, usable position without significantly altering your back focus.

    What problem do the Baader T-2 Fine-Adjustment Rings solve?

    They solve the common issue where T-2 threaded components, like a camera and a focal reducer, tighten at the wrong orientation. Without these rings, your camera's sensor might not be parallel to the horizon, or an off-axis guider port could be blocked. These rings act as shims to control the final rotational position precisely.

  • Compatibility All T-2 (M42x0.75) threads
    Material Aluminum
    Available Thicknesses 0.3mm, 0.5mm, 1.0mm
    Available Options Set of 3 (0.3/0.5/1mm), or individual thicknesses
    Net weight (kg) 0.01
    Inner Diameter / Clear Aperture (mm) T-2 (42 mm)
    Outer Diameter 45.75 mm
    Type of Adapter Extension
  • Baader Planetarium Warranty