[EASY INSTALLATION RELIABLE PERFORMANCE] These lens adapter rings are designed for effortless installation, making them a replacement for old or damaged parts. Their reliable construction ensures consistent performance, enhancing your telescopic or photographic experience without hassle.
[ ALUMINUM ALLOY CONSTRUCTION] Crafted from premium aluminum alloy, these extension tubes are built to last. The material is wear- and robust, ensuring durability even with frequent use. This makes them a dependable choice for both amateur and professional astronomers.
[PRECISION CNC MACHINING TECHNOLOGY] Utilizing advanced CNC technology, these tubes boast superior accuracy and fine workmanship. The precise machining ensures a fit and smooth operation, making them ideal for high-performance telescopic and photographic applications.
[UNIVERSAL M42x0.75mm THREAD STANDARD] Featuring both female and male threads with M42x0.75mm specifications, these adapter rings offer universal compatibility. This standard thread size ensures seamless integration with a wide range of telescopes and photographic equipment.
[VERSATILE SIZE RANGE FOR MULTIPLE ] This set includes eight different sizes (3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 30mm) to accommodate various telescope . The diverse size options provide flexibility, allowing you to extend the focal length precisely as needed for optimal performance.

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