M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP 30 mm CN

M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm

30 mm / CN
$17.29 $20.45
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M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP 30 mm CN
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP 30 mm CN
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP 30 mm CN
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
  • M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm Telescope Extension Tube HIP
M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm

M54 x 0.75 Threaded Extension Tube – Aluminum Spacer 3–30mm

$17.29 $20.45
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Ships FromCN

M54 x 0.75 Threaded Extension Tube – Precision Aluminum Spacer for Imaging & Telescope Setups

Fine-tune your telescope or imaging train with this compact M54 x 0.75 threaded extension tube. Machined from anodized aluminum with a matte interior finish, this single-piece spacer inserts cleanly between optical components to give you precise back-focus distance control — without affecting thread alignment or optical path integrity.

Available in eight thickness options (3mm to 30mm), each adapter features matching M54 x 0.75 male and female threads on both ends, making integration into any standard M54 imaging train effortless. The matte black interior helps minimize unwanted internal reflections along the optical route, while the compact 5.65 cm outer diameter keeps your overall setup neat and well-balanced.

Made in Mainland China.

Key Features

  • M54 x 0.75 Dual Threads: Matching male and female threads on both ends for seamless integration into any M54 imaging or telescope train.
  • 8 Thickness Options: Choose from 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, or 30mm to dial in your exact back-focus distance.
  • Anodized Aluminum Construction: Lightweight yet durable body with a matte interior finish to reduce internal optical scatter.
  • Compact Profile: 5.65 cm (2.22 inch) outer diameter integrates easily into standard imaging layouts.
  • Single Piece Included: Each purchase includes one extension adapter — mix and match multiple spacers for custom distance configurations.

Specifications

Material Anodized Aluminum
Thread Type M54 x 0.75 (male & female)
Outer Diameter Approx. 5.65 cm / 2.22 inch
Thickness Options 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 30mm
Quantity 1 Piece
Interior Finish Matte Black (anti-reflection)

What's in the Box

  • 1 × M54 x 0.75 Threaded Aluminum Extension Tube (thickness per selected option)

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Note: Please allow 1–2 mm variance due to manual measurement. Monitor calibration may affect color appearance in product images.

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Frequently Asked Questions

Q: What thread standard does this extension tube use?

A: This aluminum extension tube features M54 x 0.75 male and female threads on both ends, making it compatible with any standard M54 x 0.75 threaded imaging train, telescope focuser, or optical accessory using the same thread pitch.

Q: Can I stack multiple extension tubes together?

A: Yes! Because each tube has both male and female M54 x 0.75 threads, you can stack multiple spacers together to achieve a custom total back-focus distance. Simply select the individual thickness options you need and thread them in series.

Q: What is the matte interior finish for?

A: The matte black interior texture is designed to reduce unwanted light scatter and internal reflections along the optical path, helping maintain image clarity and contrast in your imaging or visual astronomy setup.

Q: How many extension tubes are included per purchase?

A: Each purchase includes one (1) extension tube of the thickness you select at checkout. Thickness options range from 3mm up to 30mm.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.

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