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PrimaLuceLab 5mm T2 Extension

PrimaLuceLab 5mm T2 Extension

by PrimaLuceLab
SKU PLL-PL3304205
CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
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  • Provides a fixed 5mm of optical path extension
  • Standard T2 male and female threads (M42x0.75)
  • Black anodized aluminum construction
  • Knurled exterior for enhanced grip
  • Internal surfaces are blackened to minimize reflections
1 in stock
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab 5mm T2 Extension

    The PrimaLuceLab 5mm T2 Extension provides a solid, single-piece 5mm spacer with T2 male and female threads, essential for correcting the backfocus distance in an imaging train that uses field flatteners or focal reducers.

    A 5mm Building Block for Perfect Backfocus

    Achieving the precise spacing specified by your corrector is non-negotiable for sharp, round stars across the entire frame. This 5mm extension serves as a rigid, reliable building block for hitting that exact distance. Unlike variable spacers which can introduce tilt, this fixed-length extension ensures perfect optical alignment.

    It can be combined with other T2 extensions and thin spacers from PrimaLuceLab, allowing you to build the exact length your imaging train requires. By stacking different components, you can achieve sub-millimeter precision, ensuring your camera sensor is placed at the optimal focal plane.

    Secure Grip and Stray Light Control

    PrimaLuceLab has engineered this T2 extension for practical use in the field. The exterior features a knurled surface, providing a secure grip for easy tightening or removal, even when wearing gloves on a cold night. This simple detail prevents frustrating moments in the dark when threads become too tight.

    Both the internal and external surfaces are black anodized. While the external finish adds durability, the internal blackening is critical for imaging. It absorbs stray light, preventing internal reflections that can reduce contrast and introduce artifacts into your final images.

  • What is the PrimaLuceLab 5mm T2 Extension primarily used for?

    The PrimaLuceLab 5mm T2 Extension is used to add exactly 5mm of spacing into an optical train. This is most commonly required to achieve the correct backfocus distance between a focal reducer or field flattener and the camera sensor, which is critical for achieving a flat, sharp field of view.

    How can I achieve a distance other than 5mm with this extension?

    This 5mm extension is part of a modular system. You can screw multiple PrimaLuceLab T2 extensions together or add their T2 spacers in between them to create a custom total length. This allows you to build up the precise distance your setup needs with sub-millimeter accuracy.

    Will the PrimaLuceLab 5mm T2 Extension cause reflections in my images?

    No, it is designed to prevent reflections. The interior of the extension is black anodized, which creates a non-reflective matte surface. This absorbs stray light within the optical tube, helping to maintain high image contrast.

    Is the PrimaLuceLab 5mm T2 Extension compatible with M48 threads?

    Not directly. This extension uses the smaller T2 (M42x0.75) thread standard. To connect it to a component with a wider M48 thread, you will need a separate M48-to-T2 adapter, such as an M48 female to T2 male adapter, to step down the thread size.

    Can I use the PrimaLuceLab 5mm T2 Extension with my Celestron EdgeHD 8" and a ZWO camera?

    Yes, this is a common application. Celestron EdgeHD systems have a specific backfocus requirement, especially when using a reducer. If your combination of ZWO camera, filter wheel, and off-axis guider leaves you approximately 5mm short of the required distance, this extension is the perfect component to add to the T2-threaded portion of your imaging train to make up the difference.

    What is the purpose of the knurling on the PrimaLuceLab 5mm T2 Extension?

    The knurled (grooved) outer ring provides a secure gripping surface. This makes it much easier to thread the extension on and off, especially in cold or damp conditions or when wearing gloves. It prevents the smooth metal surfaces from becoming difficult to separate.

    • 5mm T2 Extension

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  • PrimaLuceLab 1-Year Warranty