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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 1mm

PrimaLuceLab T2 Spacer 1mm

by PrimaLuceLab
SKU PLL-PL3304201
$12.00 - $12.00
$12.00
$12.00 - $12.00
$12.00
Price Match Policy!
  • Adds exactly 1mm of spacing to any T2 thread connection
  • Ultra-thin ring for fine-tuning back focus
  • Used with T2 extension tubes for precise optical train length
  • Solves spacing issues for field flatteners and reducers
  • Drops into female T2 threads before connecting male accessory
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab T2 Spacer 1mm

    The PrimaLuceLab T2 Spacer provides exactly 1mm of additional length to your optical train, allowing you to achieve the precise back focus required by field flatteners, reducers, and other correctors. This simple, thin spacer ring is the solution for when standard T2 extension tubes get you close to the target distance, but not exactly there.

    Achieve Critical Back Focus with 1mm Precision

    Modern optical correctors demand spacing accuracy often within a millimeter to deliver flat fields and sharp stars to the edge of the frame. The PrimaLuceLab T2 Spacer is designed to bridge the final gap that fixed-length extension tubes cannot. By simply dropping this 1mm ring into any female T2 thread before attaching the male-threaded accessory, you can incrementally adjust your total spacing to hit the exact measurement your corrector's manufacturer specifies.

  • What is the PrimaLuceLab T2 Spacer 1mm used for?

    The PrimaLuceLab T2 Spacer is used for making very small, precise adjustments to the total length of an imaging train. It adds exactly 1mm of distance, which is critical for achieving the perfect back focus required by accessories like field flatteners and focal reducers for sharp, aberration-free stars across the entire image.

    When would I need a 1mm spacer instead of a longer T2 extension tube?

    You need the PrimaLuceLab T2 Spacer 1mm when your combination of standard T2 extension tubes gets you very close to, but not exactly on, your target back focus distance. For example, if you need 55mm of back focus and your current setup gives you 54mm, this 1mm spacer provides the final, precise adjustment that a longer tube would overshoot.

    How do I install the PrimaLuceLab T2 Spacer 1mm?

    Installation is simple. You just drop the PrimaLuceLab T2 Spacer 1mm into the female T2 threads of your focuser, camera, or extension tube. Then, you carefully thread the male T2 accessory into the same port. The spacer sits between the shoulder of the male thread and the top of the female port, creating the 1mm gap.

    Why is precise back focus so critical for my telescope's field flattener?

    A field flattener is designed to work at one exact distance from the camera sensor. If the spacing is off by even a millimeter, you will see elongated or bloated stars in the corners of your images of objects like the Andromeda Galaxy (M31). The PrimaLuceLab T2 Spacer 1mm allows you to fine-tune this distance to achieve a perfectly flat field.

    Can the PrimaLuceLab T2 Spacer 1mm help me reach focus with an off-axis guider?

    Yes. An off-axis guider (OAG) requires the main imaging camera and the guide camera to be parfocal (reach focus at the same time). Sometimes, the guide camera's focus point is slightly different. A PrimaLuceLab T2 Spacer 1mm can be used in either the main imaging path or the guider path to slightly shift the focus point, helping you achieve sharp focus on both cameras simultaneously.

    Is the PrimaLuceLab T2 Spacer 1mm compatible with non-PrimaLuceLab T2 accessories?

    Yes. T2 thread (also known as M42x0.75) is a universal standard in astrophotography. The PrimaLuceLab T2 Spacer 1mm will work with any T2-threaded accessory from any manufacturer, as long as the threads are standard.

  • PrimaLuceLab 1-Year Warranty