[EASY INSTALLATION RELIABILITY] These lens extension tubes are designed for effortless installation, making them a replacement for old or damaged ones. Crafted with , they ensure performance for both beginners and professionals alike.
[ ALUMINUM ALLOY CONSTRUCTION] Made from high-quality aluminum alloy, these extension tubes are wear- and built to withstand long-term use. Their robust construction ensures they remain undamaged even under frequent handling.
[ CNC WORKMANSHIP] Utilizing advanced CNC technology, these tubes boast higher accuracy and durability. The fine workmanship ensures a fit and seamless integration with your equipment.
[VERSATILE THREAD SPECIFICATIONS] Featuring both female and male thread specifications of M42x0.75mm, these tubes offer compatibility with a wide range of devices, ensuring a secure and precise connection every time.
[MULTIPLE SIZES FOR VARIOUS NEEDS] This set includes eight different sizes (3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, and 30mm) to cater to various and applications, providing flexibility and convenience for all your projects.

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 focal 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

Note：
1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.
2. Monitors are not calibrated