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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 M48 Spacer 0.5mm

PrimaLuceLab M48 Spacer 0.5mm

by PrimaLuceLab
SKU PLL-PL3304800
$9.00 - $9.00
$9.00
$9.00 - $9.00
$9.00
Price Match Policy!
  • Provides a precise 0.5mm of spacing
  • Standard M48x0.75 female and male threads
  • Enables fine-tuning of critical back focus
  • Used with M48 extension tubes for custom lengths
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab M48 Spacer 0.5mm

    The PrimaLuceLab M48 Spacer adds a precise 0.5mm of optical path length, designed to solve critical back focus spacing issues in any M48-threaded imaging train. When standard extension tubes leave you just shy of the perfect distance for your flattener or reducer, this thin spacer provides the micro-adjustment needed to achieve sharp, round stars across the entire field.

    Achieving Critical Back Focus: The Role of a 0.5mm Spacer

    Correctors like field flatteners and focal reducers demand a highly specific back focus distance—often 55mm—to deliver a flat field. The PrimaLuceLab M48 Spacer is the solution for when your combined camera and accessory stack is off by a fraction of a millimeter. By inserting this 0.5mm spacer, you can precisely dial in the required distance that standard, larger extensions can't achieve.

    Choosing Your Spacer: 0.5mm vs. 1mm Increments

    This 0.5mm spacer is intended for the finest adjustments, where you are already very close to the ideal back focus and need only a minimal extension. For situations requiring a slightly larger adjustment, PrimaLuceLab also offers a 1mm version. Astrophotographers often keep a set of various spacer thicknesses on hand to guarantee they can achieve perfect spacing with any combination of equipment.

  • How do I use the PrimaLuceLab M48 Spacer 0.5mm in my imaging train?

    You simply thread the PrimaLuceLab M48 Spacer 0.5mm between any two M48-threaded components in your imaging train, such as between your camera and a filter wheel, or between a filter wheel and an M48 extension tube. It adds exactly 0.5mm to the total spacing.

    When would I need a 0.5mm M48 spacer instead of a standard extension tube?

    Standard extension tubes typically come in lengths of 5mm, 10mm, 20mm, and longer. You need a 0.5mm M48 spacer when the gap you need to fill is smaller than the shortest available extension tube. It's used for fine-tuning, not for making large changes to your back focus.

    My flattener requires 55mm of back focus, but my camera and filter wheel only provide 54.5mm. Will the PrimaLuceLab M48 Spacer 0.5mm fix this?

    Yes, this is the perfect application for the PrimaLuceLab M48 Spacer 0.5mm. Adding this spacer into your M48 imaging train will increase the total distance from 54.5mm to the required 55mm, ensuring your flattener performs optimally and delivers sharp stars to the edge of your frame.

    Can I stack multiple 0.5mm M48 spacers to achieve 1mm or 1.5mm of spacing?

    Yes, you can stack spacers. However, it's generally best to use the fewest number of components possible to maintain rigidity and minimize the potential for tilt in the imaging train. If you need 1mm of spacing, using a single 1mm spacer is preferable to stacking two 0.5mm spacers.

    I'm using an M48 extension for my off-axis guider, but the prism isn't fully illuminated. Could the PrimaLuceLab 0.5mm spacer help?

    It's possible. Sometimes a very small change in the position of the off-axis guider relative to the corrector can improve prism illumination. The PrimaLuceLab 0.5mm spacer could be used to slightly shift the OAG's position within the optical path, which may help align the prism with the corrected light cone.

    What material is the PrimaLuceLab M48 Spacer 0.5mm made from?

    The manufacturer does not specify the exact material. However, like all PrimaLuceLab components, it is engineered for precision and rigidity to ensure it does not introduce flexure or tilt into your astrophotography setup.

  • Product Type Spacer Ring
    Thickness 0.5mm
    Thread Type M48 x 0.75

    • M48 Spacer 0.5mm

      × 1

  • PrimaLuceLab 1-Year Warranty