- Aluminum alloy construction: Made from lightweight aluminum alloy for durability and easy handling across your astrophotography setup. - Reduced glare with matte interior: Anodized exterior and a matte inner threading minimize reflections for clearer, more precise images during astronomical observations. - Extended focusing distance: Designed to increase the distance between your camera and lens, effectively solving focusing issues and making it suitable for a range of telescopes and imaging gear. - M48 thread compatibility: Features an M48 (48 mm) threaded diameter, compatible with many cameras, lenses, and other astronomy accessories for versatile setups. - Use scenario 1: Attach to a DSLR or mirrorless camera with a refractor telescope to achieve proper focus when backfocus is tight, enabling reliable wide-field astro shots. - Use scenario 2: Pair with telephoto lenses or adapters to extend the camera-telescope distance, improving focus accuracy and image sharpness in deep-sky or planetary imaging. - Use scenario 3: Integrate with additional extension tubes or adapters to fit multiple telescope models and imaging devices, offering flexible configurations for different observing sessions.