1. Compatible with Standard 1.25 Inch Interface: The telescope accessory eyepiece has an outer diameter of 1.25 inches (31.5mm), making it compatible with most astronomical telescopes and meeting the diverse needs of astronomy enthusiasts.
2. Support Astronomical Filter Installation: The internal thread is M28.6X0.6mm, allowing for easy installation of various astronomical filters (such as lunar filters, nebula filters, etc.) to enhance observation effects and help you better observe celestial bodies like the moon and nebulae, providing a clearer and more detailed astronomical view.
3. Clear Images: This 1.25 inch eyepiece utilizes advanced colorless optical glass, ensuring stable optical properties and high optical uniformity. It guarantees no ghosting during use, delivering clear astronomical images for an exceptional observation experience.
4. Easy Installation: The eyepiece easily screws into the telescope interface, making installation straightforward. Users simply need to rotate the fixing screw to complete the installation, making it suitable for all types of astronomical observers, including beginners and professionals.
5. Aluminum Alloy Material: Made of aluminum alloy, SR4mm eyepiece is sturdy, lightweight, rustproof. Manufactured with fine craftsmanship, it delivers excellent performance for long term use.

Specification:
Item Type: 1.25 Inch SR4mm Eyepiece
Material: Aluminum Alloy, Optical Glass
Interface Size: 31.5mm / 1.2in
Eyepiece Structure: Ramsden Eyepiece
Magnification Focal​ Length: 4mm / 0.2in

How to Use:
Install and use

Package List:
1 x Storage Box
1 x 1.25 Inch SR4mm Eyepiece