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This set of lens extension tubes is designed for easy installation, making them a perfect replacement for old or damaged units, ensuring reliable performance. Constructed from high-quality aluminum alloy, these tubes are wear-resistant and built to withstand regular use without easily getting damaged. Each tube features fine workmanship CNC technology, guaranteeing higher precision and long-lasting durability.

The interface specifications are precise: the female thread is M42x0.75mm, and the male thread is also M42x0.75mm, ensuring a secure and accurate fit. These extension tubes are available in various sizes including 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, and 30mm, making them suitable for diverse telescope models and applications.

Item Type: Lens Extension Tube

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 an astronomical telescope

Extinction Treatment: Internally with extinction thread

Interface Female Thread Specification: M42x0.75mm

Interface Male Thread Specification: M42x0.75mm

Package Includes: 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, and 1 x 30mm extension tube.

Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory after-sales service.