[Universal Compatibility] : Female and male thread specifications of m42x0.75mm, suitable for various .
[Premium Material] : Crafted from high grade wear- aluminum alloy for long-lasting durability.
[Multiple Sizes] : Includes 3mm to 30mm options to cater to different telescope , providing versatility and convenience.
[Easy Installation] : Quickly replace old or damaged parts with ease, ensuring reliability.
[Precise Craftsmanship] : Utilizes cnc technology for heightened accuracy and longevity.

Spec:

Item Type: Lens Extension Tubes
Material: Aluminum Alloy
Color: Black
Product Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47in
Application: Extend the length of the primary mirror of the astronomical telescope
Extinction Treatment: Internal with extinction thread
Interface Female Thread Specification: M42x0.75mm
Interface Male Thread Specification: M42x0.75mm

Package List:
1 x 3mm Extension Tube
1 x 5mm Extension Tube
1 x 7mm Extension Tube
1 x 10mm Extension Tube
1 x 12mm Extension Tube
1 x 15mm Extension Tube
1 x 20mm Extension Tube
1 x 30mm Extension Tube

How To Use:
1. Remove the objective lens.
2. Connect the telephoto tube to the eyepiece and the objective lens.
3. Then connect the objective lens.

Note:
1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.
2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.