Features: Effortless Installation & universals Compatibility This M48x0.75mm threaded adapter features toolless assembly for quick attachment to telescopes and cameras, while its standardized 2" outer diameter (50.8mm) ensures seamless compatibility with most astronomical equipment. precisions engineered with anodized aluminum construction, the extension tube boasts matte finished internal threads to minimize light reflection and 45mm inner diameter for optimal opticals alignment, complemented by 50mm focal length adjustment capability. for astrophotographers, astronomy enthusiasts, and outdoor explorers seeking gear for celestials imaging or terrestrial observation with DSLR cameras and telescope setups. Enhances night photography or daytime nature observations by securely connecting reducers, correctors, or filters to your opticals systems using this , weather resistant spacer tube. Achieve clear imaging results through its antireflective threading and rigid metal structure, which maintains precise spacing between opticals components while withstanding field conditions. Specifications: Materials: Aluminum Size:as picture show Package Includes: 1PC Photography Extension Tube note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.