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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.
PrimaLuceLab T2 Spacer 0.5mm

PrimaLuceLab T2 Spacer 0.5mm

by PrimaLuceLab
SKU PLL-PL3304200
$12.00 - $12.00
$12.00
$12.00 - $12.00
$12.00
Price Match Policy!
  • Adds precisely 0.5mm of optical path length
  • Designed for T2 (M42x0.75) threaded systems
  • Enables fine adjustments to achieve critical back focus
  • Stackable with other spacers for custom thicknesses
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab T2 Spacer 0.5mm

    The PrimaLuceLab T2 Spacer adds exactly 0.5mm of optical path length, providing the micro-adjustment needed to achieve perfect back focus in critical imaging setups with field flatteners or focal reducers.

    Fine-Tuning Back Focus: The Role of a 0.5mm T2 Spacer

    Modern optical correctors demand spacing accuracy that standard extension tubes alone cannot provide. This 0.5mm T2 spacer is the solution for that final, critical adjustment. By inserting it between your other T2 extensions, you can precisely dial in the distance between your corrector lens and sensor plane, ensuring sharp stars across the entire frame.

    Stacking for Custom Spacing: 0.5mm vs. 1mm Increments

    While PrimaLuceLab also offers a 1mm T2 spacer, this 0.5mm version provides the highest level of precision. For imagers needing to hit a back focus target with sub-millimeter accuracy, the 0.5mm spacer is essential. You can stack multiple spacers or combine them with the 1mm version to build any required distance, such as 1.5mm or 2.5mm, without being limited to whole-millimeter steps.

  • When would I need the PrimaLuceLab T2 Spacer 0.5mm?

    You need a PrimaLuceLab T2 Spacer 0.5mm when your existing T2 extension tubes and accessories get you close to, but not exactly on, the required back focus for your flattener or reducer. If your flattener requires 55mm of spacing and your setup provides 54.5mm, this 0.5mm spacer is the perfect component to achieve a perfectly flat field.

    Is the PrimaLuceLab 0.5mm T2 Spacer threaded?

    No, this is a slip-in spacer, not a threaded ring. It is designed to be placed between two T2-threaded components (like an extension tube and a camera adapter). When you tighten the threaded components, the spacer is held securely in place by compression.

    How many PrimaLuceLab 0.5mm T2 Spacers can I stack?

    You can stack several PrimaLuceLab 0.5mm T2 Spacers to achieve a desired thickness. For larger adjustments, it's generally better to use a solid T2 extension tube to get close and then use one or two spacers for the final fine-tuning. This ensures maximum rigidity in the optical train.

    Will this 0.5mm T2 spacer cause vignetting in my f/4 telescope?

    No. The spacer has a clear aperture designed for the T2 (M42) format and will not introduce any additional vignetting beyond what is inherent in your T2-threaded adapters. It maintains the full light cone diameter provided by the rest of your imaging train.

    What is the difference between this 0.5mm spacer and PrimaLuceLab's 1mm version?

    This 0.5mm T2 spacer offers finer adjustment for higher precision. The 1mm version is for larger, yet still precise, adjustments. Many imagers keep both on hand to create any custom spacing in 0.5mm increments (e.g., combining one of each to make a 1.5mm spacer).

    Can I use the PrimaLuceLab T2 Spacer to fix camera tilt?

    No, this spacer is not designed for tilt adjustment. It provides a uniform 0.5mm of spacing across the entire field. For correcting sensor tilt, you would need a dedicated camera tilt adjuster.

  • Thickness 0.5mm
    Format T2 (M42x0.75)
    Type Slip-in Spacer

    • PrimaLuceLab T2 Spacer 0.5mm

      × 1

  • PrimaLuceLab 1-Year Warranty