1. M48 Thread Design: Astronomical telescope extension tube features standard M48x0.75mm external and internal threads, with an outer diameter of 2 inches, ensures compatibility with most telescopes, cameras, and astronomical equipment. Whether it's daily observation or astrophotography, it can be easily adapted to.
2. Matte Finish: The internal threads feature matte finish to reduce optical reflections and interference, ensuring clearer and brighter images. Particularly suitable for astronomy photography, avoiding unnecessary light reflections.
3. Focusing Problem Elimination: Equipped with both M48 female and male threads, the 5mm extension ​ allows to solve spacing issues commonly encountered in astrophotography. It effectively eliminates a range of focusing problems that may arise during the imaging process.
4. Easy to Install: Suitable for both beginners and professionals. Whether you are an astronomy enthusiast or a professional astronomy photographer, you can operate it easily, quickly connect it to the telescope frame, and conduct accurate observations or take pictures.
5. Robust Construction: The M48 extension tube boasts an all metal structure with an anodized aluminum process. This construction ensures long lasting performance even in rigorous astronomical imaging conditions.

Spec:
Item Type: M48 Astronomical Telescope Extension Tube
Material: Aluminum Alloy
Matte Finish: Equipped with Matte Threads Inside
Inner Thread Specification: M48x0.75mm
Outer Thread Specification: M48x0.75mm
Outer Diameter: 50.8mm / 2.0in
Light Transmission Aperture Diameter: 45mm / 1.8in

How to Use:
Install and use

packing list:
1 x M48 Astronomical Telescope Extension Tube