1. M48 Thread: This telescope extension tube features a standard M48x0.75mm male and female thread with an outer diameter of 2 inches (approximately 50.8mm). It ensures compatibility with most telescopes, cameras, and astronomical equipment, making it easy to adapt for both casual viewing and astrophotography.
2. Matte Finish: The internal thread is treated to reduce optical reflection and interference, ensuring clearer and brighter images. This is especially beneficial for astrophotography, minimizing unwanted light reflections that could impact image quality.
3. Accurate Focal​ Length Adjustment: This astronomical telescope extending ring​ allows for accurate image scaling, meeting the required spacing for focal​ reducers and field flatteners.
4. Easy to Install: The extending ring​ is easy to install and remove, making it suitable for both beginners and professionals. Whether you're an amateur astronomer or a professional astrophotographer, you can easily operate it and quickly connect it to your telescope mount for accurate observation or photography.
5. Material: Made from a full metal structure and utilizing anodized aluminum technology, this extension tube is built to withstand harsh environments, ensuring stable and efficient performance over long term use.

Spec:
Item Type: Astronomical Telescope Extension Tube
Material: Aluminum Alloy
Matte Finish: Internal Matte Threads
Internal Thread Specification: M48x0.75mm / 1.89x0.03in
External Thread Specification: M48x0.75mm / 1.89x0.03in
External Thread Depth: 4mm / 0.16in
Outer Diameter: 2 Inch (Approx. 50.8mm)
Flange Spacing: 20mm / 0.79in
Total Length: 24mm / 0.94in

How to Use:
Install and use.

Package List:
1 x Astronomical Telescope Extension Tube