Lightweight and strong material Constructed from aluminum alloy, this extension tube is light yet robust, providing stability without adding burden to your camera setup. Reduced glare for clear images The internal matte finish significantly reduces glare during use, helping you capture crisp celestial images. Efficient focusing solution Extends the lens-to-camera distance to address insufficient backfocus, making it an essential tool for astrophotography. M48 thread compatibility Features an M48 x 0.75 thread diameter and is compatible with a wide range of astronomical devices. Please check our size chart to confirm fit before ordering. Use cases - Resolve backfocus issues on telescopes and cameras to achieve proper focus in astrophotography. - Add clearance for adapters, filters, or accessories that require extra space between the lens and sensor. - Integrate with modular setups (refractors, guide scopes, astro cameras) for flexible configurations and rapid system changes.